Ports: Add Sonic Robo Blast 2

This commit adds Sonic Robo Blast 2, a Sonic fangame running with SDL2
to the list of SerenityOS game ports.
The game is working fine for the most part but there's some performance
issues and the mouse never resets to the center so it gets stuck in the
window's corners. It seems like the multiplayer / networking is also
not quite working but I think that this is very cool already.

Ports/SRB2/package.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env -S bash ../.port_include.sh
+port='SRB2'
+useconfigure=true
+version='2.2.13'
+depends=(
+    'curl'
+    'libpng'
+    'SDL2'
+    'SDL2_mixer'
+)
+configopts=(
+    '-B./build'
+    "-DCMAKE_TOOLCHAIN_FILE=${SERENITY_BUILD_DIR}/CMakeToolchain.txt"
+    '-DSRB2_CONFIG_ENABLE_TESTS=OFF'
+    '-DSRB2_CONFIG_SYSTEM_LIBRARIES=ON'
+    '-DSRB2_SDL2_EXE_NAME=srb2'
+)
+files=(
+    "https://github.com/STJr/SRB2/archive/refs/tags/SRB2_release_${version}.tar.gz#0fc460dc93c056c21bfcc389ac0515588673ee692968d9a6711b19e63d283b3f"
+    "https://git.do.srb2.org/STJr/srb2assets-public/-/archive/SRB2_release_${version}/srb2assets-public-SRB2_release_${version}.tar.gz#edcc98a7ad0c0878013b39ca3941cdf8094f6cbab5129911abe3022170e96b8a"
+)
+workdir="SRB2-SRB2_release_${version}"
+launcher_name='Sonic Robo Blast 2'
+launcher_category='&Games'
+launcher_command='/usr/local/games/SRB2/srb2'
+icon_file='srb2.png'
+
+install_dir='/usr/local/games/SRB2'
+
+configure() {
+    run cmake "${configopts[@]}" .
+}
+
+build() {
+    run make -C build -j${MAKEJOBS}
+}
+
+install() {
+    run /usr/bin/install -d "${SERENITY_INSTALL_ROOT}${install_dir}/"
+    run /usr/bin/install ./build/bin/srb2 ./srb2.png "${SERENITY_INSTALL_ROOT}${install_dir}"
+    run cp -r "../srb2assets-public-SRB2_release_${version}/." "${SERENITY_INSTALL_ROOT}${install_dir}/"
+}