Default iTerm color space is not AppleRGB

[ericbn]

Hi. 👋 First let me thank you for the amazing color palette you've created!

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The default iTerm color space is Generic RGB actually. And when exporting a color preset, it's saved with the sRBG color space. I've added the Alpha Component and Color Space keys to each color definition as it's exported by iTerm.

See https://github.com/mbadolato/iTerm2-Color-Schemes/issues/106

This fixes all the colors in iTerm. E.g the red color in the dark template was being rendered as #f6544f in sRGB, and now it's being correctly rendered as #fa5750.

Also, I've updated the Selection Color to use bg_2 instead of bg_1, and the Cursor Color to use fg_1 instead of fg_0, same as in other templates, for better contrast.

[ericbn]

The "readability in all conditions." line is a selected line.

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