The big refactor

After almost 2 years, I finally got a fresh release out.
Hopefully the next release won't take as long

TL;DR

Totally changed how LumpClasses work (SpecialLumpClasses are next)
Rebuilt branch script detection (still incomplete)
Split handles for internal & external lumps (can see both at once)
Massively reduced RAM consumption (more reductions to come)
Added branch scripts for pretty much every game/engine I want to support

New

• Added support for Ritual Entertainment's Ubertools (Quake III Engine Branch)
• If autoload cannot find the specified .bsp file a UserWarning is issued
• Support for ValveBsp & RespawnBsp Xbox360 formats (.360.bsp)

Changed

• Moved physics SpecialLumpClasses to branches/shared/physics.py
• Fixed up GAME_LUMP.sprp errors across source, left4dead & source_2013
• Updated both base.Struct & base.MappedArray
  • built in asserts to verify accurate definitions
  • rebuilt __init__ method, can now generate blank
  • added _bitfields attr, defines child base.BitFields
  • added _classes attr, overrides class of named attr
  • added as_bytes method
  • added as_cpp method
  • added from_bytes method
  • added from_stream method
  • added from_tuple method (replaces old __init__ behaviour)
• Added base.BitField for more reliable bitfield mapping
  • behaves similarly to base.MappedArray
• Completely refactored branch_script detection
  • only file_magic & bsp_version matter (unless .d3dbsp)
  • load_bsp now only accepts a branch_script as it's optional argument
• RespawnBsp .ent file headers moved to RespawnBsp.entity_headers
• RespawnBsp .bsp_lump moved to bsp.external
  • Uses the respawn.ExternalLumpManager
  • .bsp_lump are only opened when accesed via bsp.external.LUMP_NAME
• "MegaTest" RAM usage significantly reduced
• ArkaneBsp has been rolled into ValveBsp
• LumpHeader now use bsp.branch.LumpHeader instead of collections.namedtuple
• Support for ValveBsp & RespawnBsp x360 (big-endian) formats
• Caught some unexpected behaviour with GAME_LUMP_CLASS dict deepcopies

Newly Supported Branches

• Infinity Ward Engine
  • Call of Duty 2
  • Call of Duty 4: Modern Warfare
• Ion Storm IdTech
  • Daikatana
• Respawn Engine
  • Titanfall (Xbox360)
• Source Engine
  • Half-Life 2 (Xbox)
  • Infra
  • Momentum Mod
  • Orange Box (Xbox360)
  • Portal 2 (Xbox360)
  • Tactical Intervention
  • Vampire the Masquerade: Bloodlines
• Ubertools

Updated Support

• Id Tech 3
  • Quake III Arena
  • Raven Software Titles
• Infinity Ward Engine
  • Call of Duty
• Quake Engine
  • Hexen II
• Source Engine
• Titanfall Engine

Merged Pull Requests

• Added missing slot for apex_legends VertexLitBump by @r-ex in #18
• add plane to CM_BRUSHES by @BobTheBob9 in #22

New Contributors

• @r-ex made their first contribution in #18
• @BobTheBob9 made their first contribution in #22

Full Changelog: v0.3.1...v0.4.0