VGAPIC32

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Fill the display by using a 30MHz clock and adjusted timings.
Switched to using PORTB instead of PMDIN for pixel data output.
Update the cache status in the config register.
Added initial documentation.
Fixed bitfield information in comment.
Tidied up the comments somewhat.
Simplified the horizontal line details; introduced bus arbitration mode 2 usage.
Introduced interrupt and exception initialisation fixes plus a revised state
Update the DMA source address without disabling the channel.
Added support for updating the line data address after every other transfer.
Added line address variable (to be used) and adjusted IRQ label names.
Introduced output compare usage with Timer2 to generate the hsync pulse for each
Switch to Timer2 usage from Timer1.
Tidied and incorporated some aspects of working PMP and DMA tests.
Added some definitions for memory areas and DMA.
Introduced the framework implementing different vertical signal periods.
An attempt to produce VGA output signals with a PIC32 device.
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