Honor flip & color for Heltec T114 and T190

[todd-herbert]

Resolves #4655
Tested working on T114, but needs testing on T190

To-do: update lib_deps to point at meshtastic/st7789#1 once merged

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• Honors display.config.flip_screen when set by user
• Honors TFT_MESH color if defined in variant.h

[caveman99]

See inline comments.

EDIT: did you upstream the lib changes?

[thebentern]

Lib changes were just merged this morning

[todd-herbert]

I think @HarukiToreda is going to give this a test-run on his T190s later today to check for any unexpected weirdness too 🙏

[HarukiToreda]

i tested the flip on the T190, works great

[AaronJackson]

I recall trying a similar change to enable flipping on the Wireless Tracker, which caused it to crash at boot. I think due to the negative display offset for those boards.

firmware/variants/heltec_wireless_tracker_V1_0/variant.h

Lines 25 to 26 in 18aac0b

	#define TFT_OFFSET_X 26
	#define TFT_OFFSET_Y -1

In the end I just hard coded and did a build for that specific board to force the flip (I designed my case upside down...)

-#define TFT_OFFSET_X 26
-#define TFT_OFFSET_Y -1
+#define TFT_OFFSET_X -26
+#define TFT_OFFSET_Y 1

and changed the tft->setRotation(x) from 3 to 2.

I'm not in a position to test this at the moment unfortunately