Embed font with better UTF-8 Support

[acrosman]

The black and white versions of the patter need to support using distinct symbols when possible to replace colors in the pattern. Right now the generator using a series of UTF-8 multibyte characters from selected ranges. But the default fonts in PDF from PdfKit don't support these (see foliojs/pdfkit#262). So a different font that does have those characters needs to be embedded.

[acrosman]

Roboto helped some, but mostly things improved by moving to a much smaller range of characters. The list of symbols is still too large for Roboto. More work could be done to comment out ranges that are outside Roboto's character set, find a font with more support for non-European languages, and ideally add character ranges that add more options while being unlikely to lead to user confusion (people unexperienced with the languages need to be able to tell the difference between the symbols easily).

Existing ranges:

image2pattern/src/image2pattern.js

Lines 110 to 139 in 0f0aaed

	const symbolRanges = [
	{ start: 0x003C, stop: 0x005C }, // Capital letters and a few marks.
	{ start: 0x00A1, stop: 0x00B7 }, // Standard signs and symbols.
	{ start: 0x03A8, stop: 0x03EE }, // Greek letters.
	{ start: 0x0531, stop: 0x0556 }, // Armenian letters.
	// TODO: find an font that includes these marks and revisit if they could be used.
	// { start: 0x2600, stop: 0x26AF }, // Miscellanious Symbols.
	// { start: 0x2200, stop: 0x22FF }, // Math Operators.
	// { start: 0x2B00, stop: 0x2B2F }, // Miscellanious Symbols and arrows.
	];
	// Some symbols are too similar to others, or are political in nature and so are
	// removed to avoid frustrtion of confusion.
	const skipSymbols = [
	String.fromCodePoint(0x00AD), String.fromCodePoint(0x03D3),
	String.fromCodePoint(0x03D4), String.fromCodePoint(0x03D9),
	String.fromCodePoint(0x03DB), String.fromCodePoint(0x03DD),
	String.fromCodePoint(0x03DF), String.fromCodePoint(0x03E0),
	String.fromCodePoint(0x03E3), String.fromCodePoint(0x03E4),
	String.fromCodePoint(0x03E9), String.fromCodePoint(0x03E8),
	String.fromCodePoint(0x03EB), String.fromCodePoint(0x03EC),
	// TODO: When the rest of the code points above are restored, restore these as well.
	// String.fromCodePoint(0x2620), String.fromCodePoint(0x262D),
	// String.fromCodePoint(0x2673), String.fromCodePoint(0x2674),
	// String.fromCodePoint(0x2675), String.fromCodePoint(0x2676),
	// String.fromCodePoint(0x2677), String.fromCodePoint(0x2678),
	// String.fromCodePoint(0x2679), String.fromCodePoint(0x267C),
	// String.fromCodePoint(0x269D), String.fromCodePoint(0x269E),
	// String.fromCodePoint(0x269F),
	];

[acrosman]

Replaced Roboto with DejaVu which has support for all characters in the current space and several others.