Header file refactoring and cleaning

[kukkamario]

• Split Emu/Memory into more logical headers
  • Add vm_locking.h and vm_reservation.h and move relevant functions
    and types to these headers.
  • Change include order and make vm_ptr.h, vm_var.h and vm_ref.h headers
    usable invidually and them including vm.h instead of other way around
  • Because usage of vm::ptr now requires including vm_ptr.h instead of
    vm.h updated multiple #includes
  • Added additional #includes to vm_reservation.h and vm_locking to
    where vm::reservation_* and locking related functions are used
• Add missing #includes to header files
  • Multiple header files where missing #includes to other headers that
    where used in the header. Correct header was included in correct
    order in source files which caused everything to compile.
  • Added missing #includes so header files correctly include all their
    dependencies and fixes problems with IDEs being unable to parse
    headers correctly due to missing symbols
• Removed unnecessary includes
  • Manually went through most of the source and header files and tried to find include directives to headers that were not required for compiling that file.
  • Focused most on RSX because it seemed to have most unnecessary includes and large include lists
  • Focused on removing includes that are completely unused by the file
    • Removing includes that are duplicates because of some other required header including the same header is not necessary. They don't affect compile times and don't introduce unnecessary symbols to the compile unit. Also files shouldn't rely on other headers including headers they need.

[kukkamario]

Went manually through most of the files to remove most of the unnecessary #includes

Moved enum class texture_dimension_extended from RSXTexture.h to gcm_enums.h because it allowed a couple headers to drop include to RSXTexture.h

Removed 'WIP' tag

[kd-11]

RSX/GCM changes are good, but will need review by other developers before merge as it touches well outside my purview.

[AniLeo]

Also needs conflicts to be solved (cellAudio.h) and rebase

[kukkamario]

Rebased.

Only non-trivial changes outside RSX are Emu/Memory refactoring in the first commit.

[kd-11]

RSX side of things was resolved and is ok, but this still needs reviews from multiple other contributors.

[Zangetsu38]

Need rebase and fix few conflict

[Megamouse]

@kukkamario do you want to try again?
Sorry it wasn't merged.

[kukkamario]

I'll try to check, is this still salvageable pull request next week.

I'm busy this week and there are lot of conflicts.

[scribam]

@kukkamario Any update on this?

[kukkamario]

Okey... I finally had time to spend full day with updating my development setup and rebasing this.