Makes FontData importable resource.

Adds multi-channel SDF font texture generation and rendering support.
Adds per-font oversampling support.
Adds FontData import plugins (for dynamic fonts, BMFonts and monospaced image fonts), font texture cache pre-generation and loading.
Adds BMFont binary format and outline support.

modules/text_server_fb/SCsub

@@ -3,11 +3,23 @@
 Import("env")
 Import("env_modules")
 
+freetype_enabled = env.module_check_dependencies("text_server_fb", ["freetype"], True)
+msdngen_enabled = env.module_check_dependencies("text_server_fb", ["msdfgen"], True)
+
 env_text_server_fb = env_modules.Clone()
-env_text_server_fb.Append(
-    CPPPATH=[
-        "#thirdparty/freetype/include",
-    ]
-)
+
+if msdngen_enabled:
+    env_text_server_fb.Append(
+        CPPPATH=[
+            "#thirdparty/msdfgen",
+        ]
+    )
+
+if freetype_enabled:
+    env_text_server_fb.Append(
+        CPPPATH=[
+            "#thirdparty/freetype/include",
+        ]
+    )
 
 env_text_server_fb.add_source_files(env.modules_sources, "*.cpp")