Adding some feature to Palette Dialog

[owomomo]

Add palette preview to the Palette Dialog, you can click on the palette to customize the color and save it as a palette file.

[vadosnaprimer]

Almost forgot about this! Can you add the Reset button to restore defaults?

[vadosnaprimer]

@owomomo hello?

[ClusterM]

I resolved conflicts but it still lacks some features:

• Reset button as mentioned by @vadosnaprimer.
• fceux has 512 color palette support, what about it? Your new dialog allows you to edit only the first 64. Check RP2C03.pal for example, it contains 512 colors.

Also, why your pull request contains also many other changes? Can you describe your changes in the memory watch window?

[g0me3]

palette must be store all palette versions for all emphasis bits combinations. 64x8=512

[vadosnaprimer]

palette must be store all palette versions for all emphasis bits combinations. 64x8=512

At least optionally.