This pull request aims to fix various bugs regarding NSF driver export and execution.

This pull request improves upon and supercedes #156.

Changes in this PR:

• Major export refactoring
  • Use CCompiler pointer for writing ASM export title
  • Decouple NSFDRV header from driver data
  • Add NSF stub file for .asm export
  • Fix assembly period table export
  • Fix VRC7 period table assembly export
  • Implement "glob" multichip assembly export
  • Ignore invalid pattern data upon NSF export
    • Fixes NSF Export Issues in 0.5.0.1 #215
  • Specify what parts of pattern data are invalid
  • Differentiate between error and warning colors
  • Account for HOLD_INSTRUMENT in pattern checking
  • Specify overflow in driver bank allocation
  • Refactor compressed mode size calculation
  • Include N163 period table in .asm export
  • Declare alignment for first DPCM sample in assembly export
  • Remove hardcoded bank references in assembly song header
  • Implement bankswitched assembly config exports
  • Add bank 0 for nonbankswitching config
  • Refactor NSFe metadata generation
  • Fix NES ROM export data alignment
    • Fixes NROM iNES Export: Fix launcher kernel #278
  • Fix DPCM segment start address in nonbankswitching assembly
  • Refactor multifile export
• NSF driver fixes
  • Fix N163 instrument load clobbering Kxx state
    • Fixes NSF driver: N163 instrument load clobbering Kxx state #224.
    • Fixes NSF export sometimes skips some N163 channels #260.
    • Iterates on Update NSF Driver and NSF-related things #156
  • Fix S5B init clobbering Kxx state
    • Fixes 2A03+VRC6+MMC5 NSF export makes 2A03 pulse 1 play only pitch A-1 #256.
    • Fixes [S5B] 2A03's Pulse0 channel does not work properly when exporting an NSF with the S5B chip expansion. #246.
    • Fixes NSF Export Issues in 0.5.0.1 #215.
  • Write carrier frequency regardless of Kxx state
    • Fixes Issue with FDS modulation not being exported to NSF #196.
  • Fix phase reset behavior
  • Refactor phase reset code
  • Update effect bytecodes in row skip handling
    • Fixes Dxx does not behave properly in NSF export (under specific circumstances) #183.
  • Handle Gxx delay commands in both row and frame transitions
    • Fixes NSF export effects state corruption? #207.
  • Fix S5B instrument duty envelopes
    • Fixes S5B envelopes broken on NSF export #267.
  • Clamp pitch and hi-pitch envelope period results
  • Enable pitch sliding in linear pitch mode
  • Implement linear pitch period limit
  • Correct linear pitch calculation sequence
  • Fix length counter load not being written with pitch
    • Fixes Hardware sweep (Hxx + Ixx) and envelope (EEx) not working together in NSF export #297.
  • Prevent volume commands in DPCM channel to be written in NSF export
    • Fixes In NSF export, DPCM notes reset Vxx duty cycle of Pulse 1 #311.
• Internal fixes
  • Fix debug constexpr
• In-beta fixes:
  • Refactor Pitch/HiPitch bend logic
  • Apply N163 slide shift if linear pitch is disabled
    • Fixes (dev branch) N163's pitch slide speed is slower in NSF export compared to Famitracker playback #276.
  • Refactor period limit subroutine
    • Fixes (dev branch) N163's pitch slide speed is slower in NSF export compared to Famitracker playback #276.
  • Fix N163 portamento shift in linear period
    • Fixes (dev branch) N163's pitch slide speed is slower in NSF export compared to Famitracker playback #276.
  • Include .asm filename in NSF stub file
    • Fixes (Beta) NSF stub file doesn't include actual .asm file in .include directive #298.
  • Fix N163 Vxx indexing out of bounds
    • Fixes (beta) NSF driver N163 Vxx wave index can access out-of-bounds memory #299.

Leafuw, nyanpasu64, and Zeta, thank you for your help!