Modularize CMakeLists for submodules (#736)

* Use RecastNavigation CMakeLists

* Use tinyxml2 CMakeLists

* Use bcrypt CMakeLists

* Move variable init to CMakeLists

This has to be done here to prevent missing dependency errors.

* General improvements

Only link dynamic if on gnu
use more thirdparty cmakes

* Disable tinyxml2 testing

thirdparty/SQLite/CMakeLists.txt

@@ -0,0 +1,14 @@
+set (SQLITE3_SOURCES
+	"CppSQLite3.cpp"
+	"sqlite3.c"
+)
+
+add_library (sqlite3 ${SQLITE3_SOURCES})
+
+if(UNIX)
+	# Add warning disable flags and link Unix libraries to sqlite3
+	target_link_libraries(sqlite3 pthread dl m)
+
+	#  -Wno-unused-result -Wno-unknown-pragmas -fpermissive
+	target_compile_options(sqlite3 PRIVATE "-Wno-return-local-addr" "-Wno-maybe-uninitialized")
+endif()