Fix LUA=NO, remove ModelMixerScriptsPage when support not enabled (#869)

* Trying to align LUA options with radio/src/CMakeLists.txt
-DLUA=NO:  no Lua of any kind
-DLUA=ON:  everything but mixer scripts
-DLUA=YES: also mixer scripts

* Color LCD with -DLUA=NO is probably a rare combination, so it needed a little help with #defines.

* Some strange error using floor function w/o <math> - probably because -DLUA=NO is not normally used w/ color.

radio/src/gui/colorlcd/CMakeLists.txt

@@ -79,6 +79,10 @@ endmacro(add_gui_src)
 
 if(LUA)
   add_gui_src(standalone_lua.cpp)
+  set(SRC ${SRC} lua/widgets.cpp)
+endif()
+
+if(LUA STREQUAL YES)
   add_gui_src(model_mixer_scripts.cpp)
 endif()
 
@@ -102,10 +106,6 @@ if(GHOST)
   add_gui_src(radio_ghost_module_config.cpp)
 endif()
 
-if(LUA STREQUAL YES)
-  set(SRC ${SRC} lua/widgets.cpp)
-endif()
-
 set(SRC ${SRC} storage/modelslist.cpp)
 
 option(WINDOWS_INSPECT_BORDERS "Draw bounding boxes around windows" OFF)

radio/src/gui/colorlcd/menu_model.cpp

@@ -49,7 +49,7 @@ ModelMenu::ModelMenu():
   addTab(new ModelGVarsPage());
   addTab(new ModelLogicalSwitchesPage());
   addTab(new SpecialFunctionsPage(g_model.customFn));
-#if defined(LUA) && defined(LUA_MODEL_SCRIPTS)
+#if defined(LUA_MODEL_SCRIPTS)
   addTab(new ModelMixerScriptsPage());
 #endif
   addTab(new ModelTelemetryPage());

radio/src/gui/colorlcd/view_text.cpp

@@ -63,7 +63,7 @@ void ViewTextWindow::buildBody(Window *window)
 
   // assume average characte is 10 pixels wide, round the string length to tens.
   // Font is not fixed width, so this is for the worst case...
-  const int maxLineLength = int(floor(window->width() / 10 / 10)) * 10 - 2;
+  const int maxLineLength = static_cast<int>(window->width() / 10 / 10) * 10 - 2;
   window->setFocus();
 
   FIL file;
@@ -194,7 +194,7 @@ void ViewTextWindow::buildBody(Window *window)
 
   // assume average characte is 10 pixels wide, round the string length to tens.
   // Font is not fixed width, so this is for the worst case...
-  maxLineLength = int(floor(window->width() / 10 / 10)) * 10 - 2;
+  maxLineLength = static_cast<int>(window->width() / 10 / 10) * 10 - 2;
   maxScreenLines = window->height() / (PAGE_LINE_HEIGHT + PAGE_LINE_SPACING);
   window->setFocus();
   readLinesCount = 0;

radio/src/opentx.cpp

@@ -1499,11 +1499,12 @@ void opentxClose(uint8_t shutdown)
 
   //TODO: In fact we want only to empty the trash (private method)
   MainWindow::instance()->run();
-
+#if defined(LUA)
   luaUnregisterWidgets();
   luaClose(&lsWidgets);
   lsWidgets = 0;
 #endif
+#endif
 
 #if defined(SDCARD)
   sdDone();
@@ -1516,7 +1517,7 @@ void opentxResume()
   TRACE("opentxResume");
 
   sdMount();
-#if defined(COLORLCD)
+#if defined(COLORLCD) && defined(LUA)
   // reload widgets
   luaInitThemesAndWidgets();
 #endif