MFH: fix leak appearing when calling non-static protected or private methods as static

- MFH Add comment that explains why we need E_ERROR in those cases

- Fix remaining issue (should be last one)

- Drop useless TODO, this would need to be fixed in a generic way

- Fix flag handling in message generation

What's the [0] for here? Looks wrong and causes stuff to segv

Small tweak. Need to make array and string callback syntax behave the
same way. Also change "cannot" to "should not" since we obviously
"can" make the call.

[DOC]
- Fix callable/static mess, the following will now all result in a E_STRICT
. binding a dynamic function as a static callback
. static call of a dynamic function
. is_call

[DOC]
- Fix callable/static mess, the following will now all result in a E_STRICT
. binding a dynamic function as a static callback
. static call of a dynamic function
. is_callable() on a static binding to a dynamic function
# [marcus@frodo PHP_5_3]$ php -a -d error_reporting=8191
# make: `sapi/cli/php' is up to date.
# Interactive shell
#
# php > class t{ function f() { echo "Funny\n"; } }
# php > $c = array("t","f");
# php > call_user_func($c);
#
# Strict Standards: call_user_func() expects parameter 1 to be a valid callback, non-static method t::f() cannot be called statically in php shell code on line 1
# Funny
# php > var_dump(is_callable($c));
#
# Strict Standards: Non-static method t::f() cannot be called statically in php shell code on line 1
# bool(true)
# php > t::f();
#
# Strict Standards: Non-static method t::f() should not be called statically in php shell code on line 1
# Funny
# php >

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Fixed GC bug

Changed EG(argument_stack) implementation.

MFH: Bump copyright year, 2 of 2.

Fixed bug #43651 (is_callable() with one or more nonconsecutive colons crashes)

Fixed bug #43644 (is_callable(':') crashes)

Fixed bug #43128 (Very long class name causes segfault)

Fixed bug #43136 (possible crash on script execution timeout. The EG(function_state_ptr) is completely removed, EG(current_execute_data)->function_state must be used instead)

- Fix confusing logic (sync with HEAD)

- MFH from HEAD:
. Folding tags
. Parameter parsing
. SPL debug info
. array function improvements (not all yet)
. Improvements to function calling with call_user_* func

- MFH from HEAD:
. Folding tags
. Parameter parsing
. SPL debug info
. array function improvements (not all yet)
. Improvements to function calling with call_user_* functions
. Improvements to debugging info in var_dump/print_r
# I propably forgot already something but this all was pretty close tied
# to each other so it wasn't possible to do it in parts.

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backport zero args checks from HEAD
(fixes error message when passing parameters to a function accepting none)

Backport +/* vararg specifiers from PHP6

MFH: Added macros for managing zval refcounts and is_ref statuses

Nuke unused vars

Added support for __callstatic() magic method. (Sara)

Added support for Late Static Binding. (Dmitry, Etienne Kneuss)

Namespaces

Improved memory usage by movig constants to read only memory. (Dmitry, Pierre)