Digilent Spartan3E Platform Definiton

[rbalciunas]

Adding a board definition for the Digilent Spartan3E Starter Board.

Basic checks

• [x] Builds
• [x] Programs

Verified Peripherals

• [x] 50MHz Clock
• [ ] Aux Clock
• [ ] SMA Clock
• [x] Buttons (verified via blinky)
• [x] LEDs (verified via blinky)
• [x] Switches (verified via blinky)
• [X] Rotary Encoder
• [ ] PS/2
• [ ] RS232
• [ ] ADC
• [ ] DAC
• [ ] Amplifier
• [ ] SPI Flash
• [x] VGA Port
• [ ] 1-Wire EEPROM
• [ ] Ethernet PHY
• [ ] FPGA Config Pins
• [x] LCD
• [ ] SDRAM
• [ ] Intel StrataFlash
• [ ] CPLD
• [ ] J1 Header
• [ ] J2 Header
• [ ] J3 (FX2) Header
• [ ] J4 Header