[breaking] SPI library rework

[fpistm]

• chore(SPI): align with ArduinoCoreAPI
• chore(SPI): remove non arduino transfer api with 2 buffer
• chore(SPI): clean up internal CS pin managements
• chore(SPI): remove deprecated WiFi library workaround

To be aligned with Arduino API: https://github.com/arduino/ArduinoCore-API/blob/master/api/HardwareSPI.h
Only Hardware CS pin support kept.
Allows to save memory space (arounf 1kB) and increase execution speed ( until 30%).

Fixes #257.
Supersede #2082.

Mainly follow recommendation from @matthijskooijman : #257 (comment)

Test old vs new

• Done on all series with GraphicTests
• Saved RAM space is 48 bytes for all series.
• Time measured between fillScreen and end of setup(). (note that it include delay's value i.e. 11000 ms).
• For STM32C0xx, all unnecessary features disabled to save space including Serial. Adafruit libraries modified to remove dependencies within I2C. Time measured thanks a GPIO.

Series	Board	Flash (old)	Flash (new)	delta (bytes)	Delta (%)	Time (old)	Time (new)	delta	Delta (%)
STM32C0xx	Nucleo C031C6	30252	29212	1040	3.44%	23384	19879	3505	14.99%
STM32F0xx	Nucleo F091RC	47048	45984	1064	2.26%	25048	21226	3822	15.26%
STM32F1xx	Nucleo F103RB	36008	35016	992	2.75%	10408	7984	2424	23.29%
STM32F2xx	Nucleo F207ZG	38692	37700	992	2.56%	17315	16274	1041	6.01%
STM32F3xx	Nucleo F303RE	38332	37324	1008	2.63%	20963	18721	2242	10.70%
STM32F4xx	Nucleo F411RE	35496	34500	996	2.81%	17437	16312	1125	6.45%
STM32F7xx	Nucleo F767ZI	41260	40256	1004	2.43%	15252	14977	275	1.80%
STM32G0xx	Nucleo G071RB	50600	49536	1064	2.10%	22660	19665	2995	13.22%
STM32G4xx	Nucleo G474RE	41016	40008	1008	2.46%	16496	15747	749	4.54%
STM32H5xx	Nucleo H563ZI	56752	55716	1036	1.83%	17429	17066	363	2.08%
STM32H7xx	Nucleo H723ZG	51276	50240	1036	2.02%	6349	6231	118	1.86%
STM32L0xx	Nucleo L010RB	46600	45536	1064	2.28%	29983	24746	5237	17.47%
STM32L1xx	Nucleo L152RE	37408	36416	992	2.65%	26852	22682	4170	15.53%
STM32L4xx	Nucleo L476RG	41068	40060	1008	2.45%	18655	17182	1473	7.90%
STM32L5xx	Nucleo L552ZE	44204	43200	1004	2.27%	16827	15919	908	5.40%
STM32U5xx	Nucleo U575ZI	51079	50043	1036	2.03%	18710	18071	639	3.42%
STM32WBxx	Nucleo WB55RG	40276	39268	1008	2.50%	25124	21545	3579	14.25%
STM32WLxx	Nucleo WL55JC1	40412	39404	1008	2.49%	21347	18967	2380	11.15%

Test with Hardware CS managed by the library:

• Done with GraphicTests
• Set TFT_CS to -1 and add SPI.setSSEL(xx); before first call of tft.initR(INITR_BLACKTAB);