Add hard requirement for requests (for everything except mac-deprecated)

pyfa.py

@@ -355,6 +355,12 @@ if __name__ == "__main__":
         if int(logVersion[0]) == 0 and int(logVersion[1]) < 10:
             raise PreCheckException("Logbook version >= 0.10.0 is required.")
 
+        if 'wxMac' not in wx.PlatformInfo or ('wxMac' in wx.PlatformInfo and wx.VERSION >= (3, 0)):
+            try:
+                import requests
+            except ImportError:
+                raise PreCheckException("Cannot import requests. You can download requests from https://pypi.python.org/pypi/requests.")
+
         import eos.db
         # noinspection PyUnresolvedReferences
         import service.prefetch  # noqa: F401