add QAD::VirtualKeyboard library, vkbd for widgets with JSON-based description

cmake/FindQAD.cmake

@@ -11,6 +11,7 @@ Create imported targets:
   * QAD::SQLTable
   * QAD::TouchWidgets
   * QAD::Doc
+  * QAD::VirtualKeyboard
   * QAD::PIQt
   * QAD::PIQtUtils
 
@@ -46,7 +47,7 @@ if(QAD_FIND_VERSION VERSION_GREATER QAD_VERSION)
 	message(FATAL_ERROR "QAD version ${QAD_VERSION} is available, but ${QAD_FIND_VERSION} requested!")
 endif()
 
-set(__libs "utils;widgets;application;blockview;graphic;graphic_analysis;graphic3d;sql;sql_table;touch_widgets;doc;map")
+set(__libs "utils;widgets;application;blockview;graphic;graphic_analysis;graphic3d;sql;sql_table;touch_widgets;doc;map;virtual_keyboard")
 if (PIP_FOUND OR BUILDING_PIP)
 	list(APPEND __libs "piqt;piqt_utils")
 endif()
@@ -65,6 +66,7 @@ set(__module_doc              Doc            )
 set(__module_map              Map            )
 set(__module_piqt             PIQt           )
 set(__module_piqt_utils       PIQtUtils      )
+set(__module_virtual_keyboard VirtualKeyboard)
 
 foreach (_l ${__libs})
 	set( __inc_${_l} "")
@@ -82,6 +84,7 @@ set(__deps_sql_table        "QAD::Widgets")
 set(__deps_map              "QAD::Utils;QAD::PIQt")
 set(__deps_piqt             "QAD::Widgets;PIP")
 set(__deps_piqt_utils       "QAD::Blockview;QAD::PIQt")
+set(__deps_virtual_keyboard "QAD::PIQt")
 
 #message("find QAD ${BUILDING_QAD}")