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

Fix priority queue get_gc when empty

Fix null coalesce access

Dereference offsets on map array access

Fix naming of map handler functions

Refactoring of php subdirectory prefixes

Attempt to fix map gc

Fix return dtor macro

Fix object release memory leaks #30

Stack refactor

Object renames, priority queue updates

Pair and map adjustments, ksort

Initial map renaming

Initial map renaming

Rebased

Significant include refactor, htable renaming

Significant rename to split ds from php