delete ASM code, remove NASM

SRB2.cbp

SRB2_common.props

Srb2.dev

appveyor.yml

cmake/Modules/CMakeASM_YASMInformation.cmake

cmake/Modules/CMakeDetermineASM_YASMCompiler.cmake

cmake/Modules/CMakeTestASM_YASMCompiler.cmake

src/Android.mk

src/CMakeLists.txt

src/Makefile

src/Makefile.d/features.mk

src/Makefile.d/nix.mk

src/Makefile.d/platform.mk

src/Makefile.d/sdl.mk

src/Makefile.d/win32.mk

src/Sourcefile

src/asm_defs.inc

src/d_netcmd.c

src/p5prof.h

src/r_draw.c