tool: Moved --silient to the global config

Other global options such as --libcurl, --trace and --verbose to
follow.

tool: Moved --showerror to the global config

Other global options such as --libcurl, --trace and --verbose to
follow.

tool_getparam: Added global config to getparameter()

In preparation for parsing global options added the GlobalConfig
structure to the getparameter() function.

tool_cfgable: Added support for knowing the current operation

tool_operate: Moved easy handle cleanup into tool_main

tool_main: Moved easy handle into global config structure

tool_cfgable: Renamed Configurable structure to OperationConfig

To allow for the addition of a global config structure and prevent
confusion between the two.

tool: Fixed incorrect return code with --version from commit c10bf9bb36

tool_getparam: Moved tool_help() call into operate()

tool_getparam: Moved hugehelp() call into operate()

tool_getparam: Moved tool_version_info() call into operate()

tool_cfgable: Removed list_engine flag from config structure

In preparation for separating the global config options from the per
operation config options, reworked the list engines code

tool_cfgable: Removed list_engine flag from config structure

In preparation for separating the global config options from the per
operation config options, reworked the list engines code to not use a
member variable in the Configurable structure.

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tool_operate: Start to use CURLcode rather than int for return codes

To help assist with the detection of incorrect return codes, as per
commits ee23d13a79, 33b8960dc8 and aba98991a5, up

tool_operate: Start to use CURLcode rather than int for return codes

To help assist with the detection of incorrect return codes, as per
commits ee23d13a79, 33b8960dc8 and aba98991a5, updated the operate
based functions to return CURLcode error codes.

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tool: Fixed incorrect return code when setting HTTP request fails

During initialisation SetHTTPrequest() may fail and cURL would return
PARAM_BAD_USE, which is equivalent to CURLE_NOT_BU

tool: Fixed incorrect return code when setting HTTP request fails

During initialisation SetHTTPrequest() may fail and cURL would return
PARAM_BAD_USE, which is equivalent to CURLE_NOT_BUILT_IN in cURL error
terms.

Instead, return CURLE_FAILED_INIT as we do for other functions that may
fail during initialisation.

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tool_operate: Moved list engines into separate function in tool_help

tool_paramhlp: Added URL index to password prompt for multiple operations

tool_operate: Changed the required argument check/get to be upfront

Rather than check for required arguments, and prompt for any host and
proxy passwords, as each operation is performed,

tool_operate: Changed the required argument check/get to be upfront

Rather than check for required arguments, and prompt for any host and
proxy passwords, as each operation is performed, changed the code so
all configurations are checked before any operations are performed.

This allows the user to input all the required passwords, for example,
upfront rather than wait for each operation.

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tool_operate: Moved required argument getting into separate function

curl: output protocol headers using binary mode

Since protocol headers contain explicit line-endings there should
be no automatic conversion to ASCII text or CRLF line-endings.

curl: output protocol headers using binary mode

Since protocol headers contain explicit line-endings there should
be no automatic conversion to ASCII text or CRLF line-endings.

This might break third party tools that already depend on this
behaviour. We might need to introduce an option to make this optional.

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tool_cfgable: Moved easy handle cleanup to fix pingpong logout issues

Commmit c5f8e2f5f4 removed the easy handle clean-up from tool_operate,
letting the code that was already present in

tool_cfgable: Moved easy handle cleanup to fix pingpong logout issues

Commmit c5f8e2f5f4 removed the easy handle clean-up from tool_operate,
letting the code that was already present in free_config_fields()
perform the task. Unfortunately, this wasn't the correct place to do
this as it broke protocols, that would perform a logout, as the main
clean-up in tool_main had already been called.

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NPN/ALPN: allow disabling via command line

when using --http2 one can now selectively disable NPN or ALPN with
--no-alpn and --no-npn. for now honored with NSS only.

TODO: honor

NPN/ALPN: allow disabling via command line

when using --http2 one can now selectively disable NPN or ALPN with
--no-alpn and --no-npn. for now honored with NSS only.

TODO: honor this option with GnuTLS and OpenSSL

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tool_operate: Move the trace and error file closure to tool_cfgable

tool_operate: Added support for performing URL specific operations

tool_operate: Let curl handle cleanup take place in config_free()

tool_operate: Removed unused argument parameters from operate_do()