CMake magic to find PyQt4 and build the main GUI from .ui. Also renamed uhd_modes.py -> modes_rx, and the GUI app -> modes_gui

cmake/Modules/FindPyQt.py

@@ -0,0 +1,24 @@
+# Copyright (c) 2007, Simon Edwards <simon@simonzone.com>
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+import PyQt4.pyqtconfig
+
+pyqtcfg = PyQt4.pyqtconfig.Configuration()
+print("pyqt_version:%06.0x" % pyqtcfg.pyqt_version)
+print("pyqt_version_str:%s" % pyqtcfg.pyqt_version_str)
+
+pyqt_version_tag = ""
+in_t = False
+for item in pyqtcfg.pyqt_sip_flags.split(' '):
+    if item=="-t":
+        in_t = True
+    elif in_t:
+        if item.startswith("Qt_4"):
+            pyqt_version_tag = item
+    else:
+        in_t = False
+print("pyqt_version_tag:%s" % pyqt_version_tag)
+
+print("pyqt_sip_dir:%s" % pyqtcfg.pyqt_sip_dir)
+print("pyqt_sip_flags:%s" % pyqtcfg.pyqt_sip_flags)