add PIString::lineNumber() method

add ""_tr literal to translate string by PITranslator
add pip_tr util, now useless, only can generate *.ts
add qt_support internal lib, now only works with *.ts file
pip_vtt migrate to qt_support

utils/value_tree_translator/CMakeLists.txt

@@ -8,7 +8,7 @@ set_deploy_property(pip_vtt
 	INFO "Platform-Independent Primitives")
 make_rc(pip_vtt _RC)
 add_executable(pip_vtt "main.cpp" ${_RC})
-target_link_libraries(pip_vtt pip)
+target_link_libraries(pip_vtt pip_qt_support pip)
 if (DEFINED LIB)
 	install(TARGETS pip_vtt DESTINATION ${CMAKE_INSTALL_PREFIX}/bin)
 else()