Create Coordinates.lua module for geographic handling

[Bapham12]

Add Coordinates module for handling geographic coordinates in Lua, including conversion functions and display methods.

[graphite-app]

Variable shadowing bug. Using local keyword creates new local variables instead of modifying the function parameters lat_f and long_f. These reassignments will have no effect on the rest of the function, causing Vietnamese hemisphere flags to not be converted to English.

-- Remove 'local' keyword to modify the actual parameters:
if long_f == "B" or lat_f == "Đ" or lat_f == "T" then
    local englishFlags = {B = "N", N = "S", T = "W", ["Đ"] = "E"}
    lat_f = englishFlags[lat_f] or lat_f
    long_f = englishFlags[long_f] or long_f
end

Suggested change

	if long_f == "B" or lat_f == "Đ" or lat_f == "T" then
	local englishFlags = {B = "N", N = "S", T = "W", ["Đ"] = "E"}
	local lat_f = englishFlags[lat_f] or lat_f
	local long_f = englishFlags[long_f] or long_f
	end
	if long_f == "B" or lat_f == "Đ" or lat_f == "T" then
	local englishFlags = {B = "N", N = "S", T = "W", ["Đ"] = "E"}
	lat_f = englishFlags[lat_f] or lat_f
	long_f = englishFlags[long_f] or long_f
	end

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[graphite-app]

Incorrect error message. The error message says "vĩ độ < 0 có chữ bán cầu" (latitude < 0 with hemisphere) but this is checking long_d < 0 (longitude). This will confuse users debugging coordinate errors.

table.insert(errors, {source, "kinh độ < 0 có chữ bán cầu"})

Suggested change

	table.insert(errors, {source, "vĩ độ < 0 có chữ bán cầu"})
	table.insert(errors, {source, "kinh độ < 0 có chữ bán cầu"})

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