DMR: Hytera Over the Air Encryption (Signalling Encryption) Support; #373

DMR: Fix Hytera PDU Decryption to operate at Block Level; (Fixes confirmed data); #372

DMR: Hytera Enhanced RC4 allows variable len output for OTA, PDU or Voice;

DMR: Fix Segfault in RS12,9 encoder function where freeing static memory caused a crash;

Misc Code tweaks to accomodate new features;

examples/cygwin_bat/complete_usage_options.txt

@@ -152,6 +152,10 @@ Advanced Decoder options:
                  -H C:128:736B9A9C5645288B243AD5CB8701EF8A' 
                  -H C:256:20029736A5D91042C923EB0697484433005EFC58A1905195E28E9C7836AA2DB8' 
 
+  -H <hex>      Manually Enter Hytera OTA Encryption 32 Char Hex Key (see example below)
+                 -H O:0:0 no keystream application, but check for Hytera OTA Encryption and DMRA EP Late Entry IV.
+                 -H O:128:17bfe59b29a06136fb7d3811fd1a4904 for 128-bit RC4 OTA Key Setup
+
   -R <dec>      Manually Enter dPMR or NXDN EHR Scrambler Key Value (Decimal Value)
                  
   -1 <hex>      Manually Enter RC4 or DES Key Value (DMR, P25, NXDN) (Hex Value)