Fix conversion from bases bigger than 36.

[JoBeGaming]

The builtin int class can only convert from bases >= 2 and <= 36 (or 0), so we need our own handling for bigger bases. I guess the reason for the limit being at 36 is due to ambiguity with upper and lowercase letters.

See https://discord.com/channels/116914772766752769/165640273810948097/1537648890847830089 for an example that didn't work, but now should work. I've tested this locally with following code (so Nick doesn't merge a bug)

# ,642d 19bWBI
print(baseconvert("19bWBI", 64, 10))
# ,d264 1234567890
print(baseconvert("1234567890", 10, 64))
# ,642d 1Qnz
print(baseconvert("1Qnz", 64, 10))
# ,d264 371837
print(baseconvert("371837", 10, 64))
# ,642d abcdefg
print(baseconvert("abcdefg", 64, 10))
# ,d264 2514277534314
print(baseconvert("2514277534314", 10, 64))
# ,642d Hello
print(baseconvert("Hello", 64, 10))
# ,d264 295894002
print(baseconvert("295894002", 10, 64))

[JoBeGaming]

Oops forgot the underscore part mentioned in https://discord.com/channels/116914772766752769/1350873703872725154/1537700822098378802. I'll add that rq.

[JoBeGaming]

Also so Nick can be happy, I updated my tests (local), all still passing:

# ,642d 1Qnz
assert baseconvert("1Qnz", 64, 10) == "371837"
# ,d264 371837
assert baseconvert("371837", 10, 64) == "1Qnz"
# ,642d abcdefg
assert baseconvert("abcdefg", 64, 10) == "2514277534314"
# ,d264 2514277534314
assert baseconvert("2514277534314", 10, 64) == "abcdefg"
# ,642d Hello
assert baseconvert("Hello", 64, 10) == "295894002"
# ,d264 295894002
assert baseconvert("295894002", 10, 64) == "Hello"
# ,642d 1Q_nz
assert baseconvert("1Q_nz", 64, 10) == "371837"
# ,d264 371_8_37
assert baseconvert("371_8_37", 10, 64) == "1Qnz"
# ,642d a_b_c_d_e_f_g
assert baseconvert("a_b_c_d_e_f_g", 64, 10) == "2514277534314"
# ,d264 251427753_4314
assert baseconvert("251427753_4314", 10, 64) == "abcdefg"
# ,642d Hel_lo
assert baseconvert("Hel_lo", 64, 10) == "295894002"
# ,d264 2958_9_4002
assert baseconvert("2958_9_4002", 10, 64) == "Hello"

# INVALID
try:
    # ,642d _1Qnz
    baseconvert("_1Qnz", 64, 10)
except BaseConversionError as err:
    print(err)
try:
    # ,d264 371837_
    baseconvert("371837_", 10, 64)
except BaseConversionError as err:
    print(err)
try:
    # ,642d abc__defg
    baseconvert("abc__defg", 64, 10)
except BaseConversionError as err:
    print(err)

[FateUnix29]

We should totally merge this (LGTM).

[Nickster258]

Pretty much just line spacing adjustments util.py.