Add raylib 5.5 to our codebase and statically link with it

This way you won't need to install raylib as a dependency in order to
use it.  You'll still need its dependencies, like glfw, but this
should remove one layer of indirection.

build.sh

@@ -3,24 +3,24 @@
 set -xe
 
 OUT="cw_tree.out"
-GFLAGS="-Wall -Wextra -Wswitch-enum -std=c++17"
+GFLAGS="-Wall -Wextra -Wswitch-enum -std=c++17 -Iraylib-5.5_linux_amd64/include"
+LIBS="-Lraylib-5.5_linux_amd64/lib -l:libraylib.a" # link statically with raylib
+VARFLAGS="-DTHREAD_PAUSE_MS=1000 -DTHREAD_GENERAL_MS=1"
+
 DFLAGS="-ggdb -fsanitize=address -fsanitize=undefined"
 RFLAGS="-O2"
-VARFLAGS="-DTHREAD_PAUSE_MS=1000 -DTHREAD_GENERAL_MS=1"
 CFLAGS="$GFLAGS $VARFLAGS $DFLAGS"
-LIBS="-lraylib -lm"
-
-build() {
-    c++ $CFLAGS -o $OUT src/node.cpp src/state.cpp src/worker.cpp src/main.cpp $LIBS
-}
-
-if [ "$1" = "run" ]
-then
-    build && ./$OUT
-elif [ "$1" = "release" ]
+if [ "$1" = "release" ]
 then
     CFLAGS="$GFLAGS $VARFLAGS $RFLAGS"
-    build;
-else
-    build;
+    shift 1
+elif [ "$1" = "debug" ]
+then
+    shift 1
+fi
+
+c++ $CFLAGS -o $OUT src/node.cpp src/state.cpp src/worker.cpp src/main.cpp $LIBS
+if [ "$1" = "run" ]
+then
+    ./$OUT
 fi