Add image command

[Cellivar]

Closes #10

This PR adds image command support, along with some small tweaks to related commands.

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	24.21%	1710 / 7061
🔵	Statements	24.21%	1710 / 7061
🔵	Functions	48.81%	103 / 211
🔵	Branches	88.93%	217 / 244

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/Commands/BasicCommands.ts	28.34%	100%	48.27%	28.34%	5-8, 59-69, 74-96, 99-105, 108-114, 117-123, 126-132, 152-168, 193-203, 206-212, 215-221, 226-240, 243-256, 261-269, 272-282
src/Languages/EscPos/BasicCommands.ts	23.07%	50%	14.28%	23.07%	22-38, 41-49, 52-110, 113-132, 135-152, 155-163, 208-220, 223-284, 290-295, 298-306, 309-325, 328-337
src/Languages/EscPos/EscPos.ts	100%	100%	28%	100%
src/ReceiptLine/ESCPOS.js	0%	0%	0%	0%	1-573
src/ReceiptLine/Parser.ts	0%	0%	0%	0%	1-1079
src/ReceiptLine/RECEIPTLINE.js	0%	0%	0%	0%	1-2658
src/Util/ASCII.ts	100%	92.85%	100%	100%
src/Util/BitmapGRF.ts	78.68%	90.19%	72.72%	78.68%	57-58, 61-62, 135-147, 165-166, 168-169, 227-262, 266-283, 292-293, 374-377, 484-486
src/Util/index.ts	100%	100%	100%	100%

Generated in workflow #34 for commit 85ed4d0 by the Vitest Coverage Report Action