RSSI draw/ Level app opt

[zxkmm]

• make the peak of RSSI max val into orange color (it's the peak of RSSI max AKA red color), so should be similar color
• make the dB from RSSIGraph has RSSI too (Level app parallel them, so need to have both on them)
• after the Theme system, some remain Color call here should be satisfied to theme system, but won't do that in this PR.
• the blue paint is broken somewhere but not here.

[zxkmm]

The H4m is original design. The h2 is the new design.

[gullradriel]

I like it.

[gullradriel]

Looks good to me, once the conversations are solved, let's merge it :-)

[zxkmm]

Shouldn't this be done in the "if (last_max_db != statistics.max_db) {" following block ?

ohhh ya thanks for the catch! it can save a lot

Is the set_dirty needed here ?

You are right, no need to set dirty here, sorry for my lazy code XD, was just too lazy lol.

All fixed, thanks again!