[ox] Move header files to include directory

CMakeLists.txt

@@ -78,6 +78,13 @@ include_directories(src)
 
 install(FILES OxConfig.cmake DESTINATION lib/cmake/ox)
 
+install(
+    DIRECTORY
+        include/ox
+    DESTINATION
+        include
+)
+
 if(OX_USE_STDLIB)
 	set(JSONCPP_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/deps/jsoncpp/include")
 	add_subdirectory(deps/jsoncpp)

include/ox/model/definition-language.txt

@@ -0,0 +1,7 @@
+<Type>      : <TypeName><FieldList>
+<FieldList> : <FieldList> | <FieldList><Field>
+<Field>     : <FieldType><TypeID><FieldName>
+<TypeID>    : <TypeName> | <TypeName><Type>
+<TypeName>  : <string>
+<FieldType> : <0: single> | <1: list>
+<FieldName> : <string>