Slightly relaxed vertical sync testing.

Merge pull request #148 from TomHarte/CSW

Adds support for the CSW file format

Merge pull request #126 from TomHarte/GCRAnalysis

Corrects infinite loop when performing GCR analysis

Merge pull request #123 from TomHarte/RemovedDeadOption

Formally withdraws the 'load automatically' option for the Vic

Fixed: operation reads now fulfil the promise of seeding the value to…

… be read with 0xff.

Merge pull request #116 from TomHarte/YarsBug

Fixes a bug in which TIA access during the border would flush all motion steps.

This needs to be a `memmove` as the areas may overlap.

Merge pull request #97 from TomHarte/Icons

Introduces some file association icons

Merge pull request #93 from TomHarte/ReadWriteTrack

Implements the Type 3 WD177x commands

Merge pull request #92 from TomHarte/MFMCleanup

Adds some documentation and tidies some of the new MFM infrastructure