Batch-editing for pins

I hope to add batch modification of schematic symbol pins in later versions

Description

Many times, when creating multi pin MCU symbols, you will encounter the need to edit the pin attributes in batch, such as the electrical type of pins, the length of pins, etc. I think it will bring a lot of inconvenience if there is no function of batch modification of pins, because it is really tired to modify more than 200 pins one by one 😂

Steps to reproduce

1.Pin batch modification

KiCad Version

Application: KiCad (64-bit)

Version: (5.99.0-12719-gf9c83dbc44), release build

Libraries:
	wxWidgets 3.1.5
	libcurl/7.78.0-DEV Schannel zlib/1.2.11

Platform: Windows 10 (build 17763), 64-bit edition, 64 bit, Little endian, wxMSW

Build Info:
	Date: Oct  7 2021 12:01:10
	wxWidgets: 3.1.5 (wchar_t,wx containers)
	Boost: 1.76.0
	OCC: 7.5.0
	Curl: 7.78.0-DEV
	ngspice: 35
	Compiler: Visual C++ 1929 without C++ ABI

Build settings:
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON