libifpscc: initial commit
readme: document ifpscc/libifpscc
license: add credits for ifpscc/libifpscc (derived from code also MIT licensed)
libifps: make additional fields/types public for libifpscc
libifps: fix field documentation for some opcodes
libifps: fix loading functions that are not exported
libifps: allow saving a nonexistant primitive type if the same primitive type was added already
libifps: fix parsing Extended constants
libifps: fix ushort/short being mapped to the wrong types in one table
csproj: set Prefer32Bit=false for release builds
