Improve meson build.

-Add all required packages as wrap dependencies
-Move source lsitnings to separate files
-Proper dependencies declarations
-Set global D compiler arguments
-Add few asserts
-Add test exe
-Other small improvements

Tested with dmd with betterC, demos executable has to be run from 'demos' directory to properly load assets.

subprojects/packagefiles/bindbc-loader/meson.build

@@ -0,0 +1,24 @@
+project('bindbc-loader', 'd', version : '0.3.2', default_options: ['default_library=static'])
+
+# Files
+src = files(
+	'source/bindbc/loader/package.d',
+	'source/bindbc/loader/sharedlib.d',
+	'source/bindbc/loader/system.d',
+)
+
+inc = include_directories('source')
+
+# Dependencies
+lib = library('bindbc-loader', src,
+	include_directories : [inc],
+	pic : true,
+	d_module_versions: ['BindBC_Static'],
+)
+
+bindbc_loader_dep = declare_dependency(
+	include_directories : [inc],
+	link_with : lib,
+)
+
+meson.override_dependency('bindbc-loader', bindbc_loader_dep)

subprojects/packagefiles/bindbc-sdl/meson.build

@@ -0,0 +1,72 @@
+project('bindbc-sdl', 'd', version : '0.19.2', default_options: ['default_library=static'])
+
+# Files
+src = files(
+	'source/bindbc/sdl/bind/package.d',
+	'source/bindbc/sdl/bind/sdl.d',
+	'source/bindbc/sdl/bind/sdlassert.d',
+	'source/bindbc/sdl/bind/sdlatomic.d',
+	'source/bindbc/sdl/bind/sdlaudio.d',
+	'source/bindbc/sdl/bind/sdlblendmode.d',
+	'source/bindbc/sdl/bind/sdlclipboard.d',
+	'source/bindbc/sdl/bind/sdlcpuinfo.d',
+	'source/bindbc/sdl/bind/sdlerror.d',
+	'source/bindbc/sdl/bind/sdlevents.d',
+	'source/bindbc/sdl/bind/sdlfilesystem.d',
+	'source/bindbc/sdl/bind/sdlgamecontroller.d',
+	'source/bindbc/sdl/bind/sdlgesture.d',
+	'source/bindbc/sdl/bind/sdlhaptic.d',
+	'source/bindbc/sdl/bind/sdlhints.d',
+	'source/bindbc/sdl/bind/sdljoystick.d',
+	'source/bindbc/sdl/bind/sdlkeyboard.d',
+	'source/bindbc/sdl/bind/sdlkeycode.d',
+	'source/bindbc/sdl/bind/sdlloadso.d',
+	'source/bindbc/sdl/bind/sdllog.d',
+	'source/bindbc/sdl/bind/sdlmessagebox.d',
+	'source/bindbc/sdl/bind/sdlmouse.d',
+	'source/bindbc/sdl/bind/sdlmutex.d',
+	'source/bindbc/sdl/bind/sdlpixels.d',
+	'source/bindbc/sdl/bind/sdlplatform.d',
+	'source/bindbc/sdl/bind/sdlpower.d',
+	'source/bindbc/sdl/bind/sdlrect.d',
+	'source/bindbc/sdl/bind/sdlrender.d',
+	'source/bindbc/sdl/bind/sdlrwops.d',
+	'source/bindbc/sdl/bind/sdlscancode.d',
+	'source/bindbc/sdl/bind/sdlshape.d',
+	'source/bindbc/sdl/bind/sdlstdinc.d',
+	'source/bindbc/sdl/bind/sdlsurface.d',
+	'source/bindbc/sdl/bind/sdlsystem.d',
+	'source/bindbc/sdl/bind/sdlsyswm.d',
+	'source/bindbc/sdl/bind/sdlthread.d',
+	'source/bindbc/sdl/bind/sdltimer.d',
+	'source/bindbc/sdl/bind/sdltouch.d',
+	'source/bindbc/sdl/bind/sdlversion.d',
+	'source/bindbc/sdl/bind/sdlvideo.d',
+	'source/bindbc/sdl/bind/sdlvulkan.d',
+	'source/bindbc/sdl/config.d',
+	'source/bindbc/sdl/dynload.d',
+	'source/bindbc/sdl/image.d',
+	'source/bindbc/sdl/mixer.d',
+	'source/bindbc/sdl/net.d',
+	'source/bindbc/sdl/package.d',
+	'source/bindbc/sdl/ttf.d',
+)
+
+inc = include_directories('source')
+
+# Dependencies
+bindbc_loader_dep = dependency('bindbc-loader')
+
+lib = library('bindbc-sdl', src,
+	dependencies : bindbc_loader_dep,
+	include_directories : [inc],
+	d_module_versions: ['BindBC_Static'],
+	pic : true,
+)
+
+bindbc_sdl_dep = declare_dependency(
+	include_directories : [inc],
+	link_with : lib,
+)
+
+meson.override_dependency('bindbc-sdl', bindbc_sdl_dep)

subprojects/packagefiles/cimgui/meson.build

@@ -0,0 +1,29 @@
+project('cimgui', 'cpp', version : '1.73.0', default_options: ['default_library=shared', 'warning_level=1'])
+
+# Files
+src = [
+	'cimgui.cpp',
+	'imgui/imgui.cpp',
+	'imgui/imgui_draw.cpp',
+	'imgui/imgui_demo.cpp',
+	'imgui/imgui_widgets.cpp',
+]
+
+inc = [ '.' ]
+pub_inc = [ 'imgui' ]
+
+# Dependencies
+# bindbc_loader_dep = dependency('bindbc-loader')
+
+lib = shared_library('cimgui', src,
+	# dependencies : bindbc_loader_dep,
+	include_directories : [inc, pub_inc],
+	# pic : true,
+)
+
+cimgui_dep = declare_dependency(
+	include_directories : [pub_inc],
+	link_with : lib,
+)
+
+meson.override_dependency('cimgui', cimgui_dep)