configure settings.xml during build to define USB not supported

This change it to settings.xml.in and set on add-on compile the settings usable or not.
Is done by change the `<visible>` value and set of default connection type.
The settings are still inside to prevent problems if something tries somewhere to read it.

Further can for build the cmake configuration value "-DUSB_DEVICE_SUPPORT=0" used and if wanted to disable USB support.

Author: AlwinEsch

CMakeLists.txt

@@ -4,11 +4,25 @@ project(pvr.rtlradio)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${PROJECT_SOURCE_DIR}/cmake)
 
 option(DISTRIBUTION_BUILD "Linux distribution build (without use of depends folder)" OFF)
-
 if(CORE_SYSTEM_NAME STREQUAL windowsstore)
   set(USB_DEVICE_SUPPORT False)
 else()
-  set(USB_DEVICE_SUPPORT True)
+  option(USB_DEVICE_SUPPORT "Build add-on with USB device support, if set to \"OFF\" RTL-SDR can only be accessed via network" ON)
+endif()
+
+# Set values used about configure of settings.xml.in on add-on
+if(NOT USB_DEVICE_SUPPORT)
+  set(SETTINGS_XML_IN_CONNECTION_TYPE_NOTE "USB device not suppoted on this add-on, due to this the following setting is not usable and marked as not visible.")
+  set(SETTINGS_XML_IN_CONNECTION_TYPE_DEFAULT "1")
+  set(SETTINGS_XML_IN_CONNECTION_TYPE_VISIBLE "false")
+  set(SETTINGS_XML_IN_NO_USB_BEGIN "<!--")
+  set(SETTINGS_XML_IN_NO_USB_END "-->")
+else()
+  set(SETTINGS_XML_IN_CONNECTION_TYPE_NOTE "USB device supported on this add-on.")
+  set(SETTINGS_XML_IN_CONNECTION_TYPE_DEFAULT "0")
+  set(SETTINGS_XML_IN_CONNECTION_TYPE_VISIBLE "true")
+  set(SETTINGS_XML_IN_NO_USB_BEGIN "")
+  set(SETTINGS_XML_IN_NO_USB_END "")
 endif()
 
 find_package(Kodi REQUIRED)

pvr.rtlradio/resources/settings.xml pvr.rtlradio/resources/settings.xml.in

@@ -5,9 +5,11 @@
     <category id="device" label="30000">
       <group id="1" label="-1">
 
+        <!-- @SETTINGS_XML_IN_CONNECTION_TYPE_NOTE@ -->
         <setting id="device_connection" type="integer" label="30100" help="30500">
           <level>0</level>
-          <default>0</default>
+          <visible>@SETTINGS_XML_IN_CONNECTION_TYPE_VISIBLE@</visible>
+          <default>@SETTINGS_XML_IN_CONNECTION_TYPE_DEFAULT@</default>
           <constraints>
             <options>
               <option label="30200">0</option>
@@ -17,8 +19,10 @@
           <control type="spinner" format="integer"/>
         </setting>
 
+        <!-- @SETTINGS_XML_IN_CONNECTION_TYPE_NOTE@ -->
         <setting id="device_connection_usb_index" parent="device_connection" type="integer" label="30101" help="30501">
           <level>0</level>
+          <visible>@SETTINGS_XML_IN_CONNECTION_TYPE_VISIBLE@</visible>
           <default>0</default>
           <constraints>
             <minimum>0</minimum>
@@ -37,9 +41,11 @@
           <constraints>
             <allowempty>true</allowempty>
           </constraints>
+          @SETTINGS_XML_IN_NO_USB_BEGIN@
           <dependencies>
             <dependency type="visible" setting="device_connection" operator="is">1</dependency>
           </dependencies>
+          @SETTINGS_XML_IN_NO_USB_END@
           <control type="edit" format="ip">
             <heading>30102</heading>
           </control>
@@ -53,9 +59,11 @@
             <minimum>0</minimum>
             <maximum>65535</maximum>
           </constraints>
+          @SETTINGS_XML_IN_NO_USB_BEGIN@
           <dependencies>
             <dependency type="visible" setting="device_connection" operator="is">1</dependency>
           </dependencies>
+          @SETTINGS_XML_IN_NO_USB_END@
           <control type="edit" format="integer">
             <heading>30103</heading>
           </control>

src/addon.cpp

@@ -1153,8 +1153,12 @@ ADDON_STATUS addon::Create(void)
       }
 
       // Load the device settings
+#ifdef USB_DEVICE_SUPPORT
       m_settings.device_connection =
           kodi::addon::GetSettingEnum("device_connection", device_connection::usb);
+#else
+      m_settings.device_connection = device_connection::rtltcp;
+#endif
       m_settings.device_connection_usb_index =
           kodi::addon::GetSettingInt("device_connection_usb_index", 0);
       m_settings.device_connection_tcp_host =