Add extended A2M/A2T file support (v1 to v14) (#6)

- add the required C bitpacking libraries into `deps/`
- add a2m-v2 impl
- replace A2M loader in main application
- add the necessary C dependencies
- tweak CMakeLists to include dependencies and compile C code

Code adapted from adplug/adplug#207

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.14)
-project(adlib2vgm LANGUAGES CXX)
+project(adlib2vgm LANGUAGES CXX C)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -12,6 +12,7 @@ include_directories("binio" "utfcpp" "zstr")
 
 file(GLOB_RECURSE SOURCES_BINIO "binio/*.cpp")
 file(GLOB_RECURSE SOURCES_FMTS "Formats/*.cpp")
+file(GLOB_RECURSE SOURCES_FMTS_DEPS "deps/*.c")
 file(GLOB_RECURSE SOURCES_FAKE_ADPLUG "FakeAdplug/*.cpp")
 
 set(CMAKE_FIND_LIBRARY_SUFFIXES .a)
@@ -24,9 +25,12 @@ add_executable(adlib2vgm
 	${SOURCES_BINIO}
 	${SOURCES_GZSTREAM}
 	${SOURCES_FAKE_ADPLUG}
+	${SOURCES_FMTS_DEPS}
 	${SOURCES_FMTS}
 	main.cpp
 	VgmOpl.cpp
 )
 
+target_include_directories(adlib2vgm PRIVATE "deps")
+
 target_link_libraries(adlib2vgm ${ZLIB})

Formats/Formats.h

@@ -20,6 +20,7 @@
 #pragma once
 
 #include "a2m.h"
+#include "a2m-v2.h"
 #include "adtrack.h"
 #include "amd.h"
 #include "bam.h"