Allow robotics cape to be included in gateware design with any name.

Support PWM and H bridge GPIO control for the Robotics cape.

Enable power to the camera module by default to simplify board testing.

- Optimize MSS GPIO_2 usage.
- GPIOS build option now uses GPIOs for all cape pins except I2C on
  P9_PIN19 and P9_PIN20 which are hard-wired to MSS I2C.
- Move user LEDs control to MSS GPIO_2.

All gateware components now use the "DEFAULT" directory for their
default configuration. Previously a mix of "DEFAULT" and "NONE" were
used depending on the gateware component.

Camera PHY bringing camera data to cape pins for board validation
and debug.

The PROG_EXPORT_PATH script argument should eventually replace
FPE_EXPORT_PATH to specify the location of the generated programming
files whether for FlashProExpress, programming through Linux or using
DirectC.

Use the gateware's top level name to name the FlashPro Express job
files to ease identification of gateware variants.

The TOP_LEVEL_NAME build argument allows choosing the name of the
gateware's top level name. This can be used to identify different
variants of the gateware design.