fix(color): Clear Lua lcd buffer and display 'Loading...'

[philmoz]

Fixes #2810

Summary of changes:

Clear the Lcd buffer and display "Loading..." text in the constructor for StandaloneLuaWindow

[ajjjjjjjj]

PL
#define TR_LOADING "Ładowanie..."

[pfeerick]

I had actually done this a while ago, but didn't like it as it means for lighter scripts it means the screen flashes black between the tools and the lua script... so had explored trying to pre-load the lua buffer with the the last frame from the regular double-frame buffer and drawing the loading message on that, but hadn't managed to get that working consistently. So this will at least stop the complaints about screen garbage / last Lua script frame being shown :)

[pfeerick]

Can we get some translations for this please 😃

It gets written to the middle of the screen while a Tools Lua script is being loaded

#define TR_LOADING "Loading..."

@HThuren DA
@ParkerEde DE
@Eldenroot CZ
@ulfhedlund SE
@robustini IT
@zyren CN / TW
@ajjjjjjjj PL Thanks for beating me to the punch :)
@ToshihiroMakuuchi JP

[TheIsotopes]

@pfeerick DE is already in the review, but here again
#define TR_LOADING "Wird geladen..."

[Eldenroot]

CZ: Načítání...

[robustini]

IT
#define TR_LOADING "Caricamento..."

[ulfhedlund]

SE #define TR_LOADING "Laddar..."

[ToshihiroMakuuchi]

JP
#define TR_LOADING "読み込み中..."

[HThuren]

DK
#define TR_LOADING "Indlæser..."

[zyren]

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CN
#define TR_LOADING "加载中..."

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TW
#define TR_LOADING "加載中..."

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