fpga: Multiple X300 FPGA bugfixes and enhancements

- Fixed 10GigE firmware communication issues and sequence errors for TX
- Multiple changes to help ease timing closure
- Cleaned up build scripts
- Switched to Xilinx ISE 14.7 as the default build tool for X300


Original-commit: 64d71dcbc5fa6790385b288de25224d386b047b0

top/x300/coregen_dsp/hbint3.xise

@@ -12,7 +12,7 @@
     <!-- Copyright (c) 1995-2013 Xilinx, Inc.  All rights reserved. -->
   </header>
 
-  <version xil_pn:ise_version="14.6" xil_pn:schema_version="2"/>
+  <version xil_pn:ise_version="14.7" xil_pn:schema_version="2"/>
 
   <files>
     <file xil_pn:name="hbint3.ngc" xil_pn:type="FILE_NGC">