[FL-2481] Renamed assets->resources; enforcing Manifest build if it does not exist (#1135)

* Renamed assets->resources; enforcing Manifest build if it does not exist
* Rebuild resources from CI
* Added Manifest to repo - be sure to rebuild it with `make -C assets` before committing changes!
* Actually added Manifest.
* Keeping Manifest on assets clean
* Spelling fix in Makefile

make/rules.mk

@@ -86,7 +86,6 @@ $(OBJ_DIR)/upload: $(OBJ_DIR)/$(PROJECT).bin
 	dfu-util -d 0483:df11 -D $(OBJ_DIR)/$(PROJECT).bin -a 0 -s $(FLASH_ADDRESS) $(DFU_OPTIONS)
 	touch $@
 
-
 .PHONY: flash
 flash: $(OBJ_DIR)/flash