Add subprojects for Meson

Include subprojects so we can deprecate dependencies.txt

.gitmodules

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+[submodule "subprojects/SDL"]
+	path = subprojects/SDL
+	url = https://github.com/libsdl-org/SDL.git
+	branch = SDL2
+[submodule "subprojects/SDL_image"]
+	path = subprojects/SDL_image
+	url = https://github.com/libsdl-org/SDL_image.git
+	branch = SDL2
+[submodule "subprojects/SDL_ttf"]
+	path = subprojects/SDL_ttf
+	url = https://github.com/libsdl-org/SDL_ttf.git
+	branch = SDL2
+[submodule "subprojects/minIni"]
+	path = subprojects/minIni
+	url = https://github.com/compuphase/minIni.git
+[submodule "subprojects/bdd-for-c"]
+	path = subprojects/bdd-for-c
+	url = https://github.com/grassator/bdd-for-c.git
+[submodule "subprojects/portmidi"]
+	path = subprojects/portmidi
+	url = https://github.com/PortMidi/portmidi.git
+[submodule "subprojects/getopt-for-windows"]
+	path = subprojects/getopt-for-windows
+	url = https://github.com/Chunde/getopt-for-windows.git
+[submodule "subprojects/libwebsockets"]
+	path = subprojects/libwebsockets
+	url = https://github.com/warmcat/libwebsockets.git
+[submodule "subprojects/openssl"]
+	path = subprojects/openssl
+	url = https://github.com/openssl/openssl.git
+[submodule "subprojects/sqlite"]
+	path = subprojects/sqlite
+	url = https://github.com/sqlite/sqlite.git
+[submodule "subprojects/bdd-for-c-mocks"]
+	path = subprojects/bdd-for-c-mocks
+	url = https://code.modal.sh/TheoryOfNekomata/bdd-for-c-mocks.git
+[submodule "subprojects/alsa-lib"]
+	path = subprojects/alsa-lib
+	url = git://git.alsa-project.org/alsa-lib.git

subprojects/SDL

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+Subproject commit 7b0600726679c52f609ccce0e92314c7852c8aa5

subprojects/SDL_image

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+Subproject commit 44354bc1a5b472e1755761fb1405d768a69bbb74

subprojects/SDL_ttf

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+Subproject commit c643f520c22d3e6442cc7cda4026c9cd1e6e52ec

subprojects/alsa-lib

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+Subproject commit 44705e3a2050162c4f434d712d22bfe3f7fb5021

subprojects/bdd-for-c

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+Subproject commit aec2afa6a1d801f88e1b16101038e69f89ded6c8

subprojects/bdd-for-c-mocks

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+Subproject commit ff1b18d8089e36cf76f78224f0e899f5e06db7e4

subprojects/getopt-for-windows

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+Subproject commit 76fe2df86f84771775fd2f1a641a09adbce28df7

subprojects/libwebsockets

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+Subproject commit e8eb7d6bd66dde2156dbcd37b0e9048ed4006320

subprojects/minIni

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+Subproject commit 755f9a8b5c3b8d8ced9bd2d9173dd1d1cac8efc2

subprojects/openssl

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+Subproject commit d54e91d3944304bca2bd4c74af52ccffc49c6126

subprojects/portmidi

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+Subproject commit db77727e0f99948af730a3f613f6fe2e7b83620d

subprojects/sqlite

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+Subproject commit e17cac189fb40f4b1ccca04e54bf8163de555ae3