Fix #206: Null coalescing operator on Vector make search failed

This happens because php_ds_vector_read_dimension makes a REF from the value
when type is not BP_VAR_R. So when the type i

Fix #206: Null coalescing operator on Vector make search failed

This happens because php_ds_vector_read_dimension makes a REF from the value
when type is not BP_VAR_R. So when the type is BP_VAR_IS then we see the first
element becomes a reference. You can see this when doing var_dump.

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review object management

Fix array access

First steps to PHP 8 support

Clean up set op comments, moved to new branch

Refactoring of php subdirectory prefixes

Partial refactor to fix wall

Add set gc handler

Fix set by reference handler, attempt memtest

Fix object release memory leaks #30

Free objects when unserialize fails

Stack refactor

Set refactor

Rename all class entry files to have "ce" be a suffix

Significant include refactor, htable renaming

Significant rename to split ds from php