Exec command improvements

[PAndaContron]

• All aliases for language names now work properly, now using a less hacky implementation than the copy-pasting from before.
• All languages now have a logo.

[pep8speaks]

Hello @PAndaContron! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file cogs/codeexecutioncog.py:

Line 22:89: E501 line too long (126 > 88 characters) Line 52:89: E501 line too long (117 > 88 characters) Line 81:89: E501 line too long (138 > 88 characters) Line 99:89: E501 line too long (114 > 88 characters) Line 111:89: E501 line too long (138 > 88 characters) Line 117:89: E501 line too long (116 > 88 characters) Line 123:89: E501 line too long (185 > 88 characters) Line 129:89: E501 line too long (128 > 88 characters) Line 135:89: E501 line too long (104 > 88 characters) Line 141:89: E501 line too long (122 > 88 characters) Line 153:89: E501 line too long (140 > 88 characters) Line 159:89: E501 line too long (158 > 88 characters) Line 165:89: E501 line too long (126 > 88 characters) Line 171:89: E501 line too long (124 > 88 characters) Line 177:89: E501 line too long (125 > 88 characters) Line 183:89: E501 line too long (148 > 88 characters) Line 189:89: E501 line too long (126 > 88 characters) Line 195:89: E501 line too long (103 > 88 characters) Line 213:89: E501 line too long (504 > 88 characters) Line 219:89: E501 line too long (90 > 88 characters) Line 231:89: E501 line too long (128 > 88 characters)

[PAndaContron]

I'm going to fucking strangle you @pep8speaks