Remove unused submodules, set cmake policy for boost

.gitmodules

@@ -1,21 +1,6 @@
-[submodule "submodules/glm"]
-	path = submodules/glm
-	url = https://github.com/g-truc/glm.git
-[submodule "submodules/fmt"]
-	path = submodules/fmt
-	url = https://github.com/fmtlib/fmt.git
-[submodule "submodules/libuv"]
-	path = submodules/libuv
-	url = https://github.com/libuv/libuv.git
-[submodule "submodules/cereal"]
-	path = submodules/cereal
-	url = https://github.com/USCiLab/cereal.git
 [submodule "submodules/websocketpp"]
 	path = submodules/websocketpp
 	url = https://github.com/zaphoyd/websocketpp.git
-[submodule "submodules/recastnavigation"]
-	path = submodules/recastnavigation
-	url = https://github.com/EQEmu/recastnavigation.git
 [submodule "submodules/vcpkg"]
 	path = submodules/vcpkg
 	url = https://github.com/microsoft/vcpkg.git

CMakeLists.txt

@@ -12,6 +12,11 @@ endif()
 
 project(EQEmu)
 
+#explicitly set CMP0167 for Find Boost
+if(POLICY CMP0167)
+  cmake_policy(SET CMP0167 NEW)
+endif()
+
 if(NOT CMAKE_BUILD_TYPE)
 	set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "Choose the type of build." FORCE)
 endif()