IndexError when outputting Base64 strings to a table

[SimonHertoge]

When scanning an Office document using the office module with --vba option, one of the sections olevba returns is the "Base64 strings":
https://github.com/viper-framework/viper-modules/blob/master/office.py#L405

This eventually is printed as a table by terminaltables, but crashes when the decoded base64 text contains raw bytes which correspond with newline characters (\r, \n, \f, maybe some others). As a result viper-web does not output anything and returns the following error:
We were unable to complete the command surface . Error: list index out of range

This is what happens in olevba first:

import base64
encoded = "go4ihosidlsHDasd"
decoded = base64.b64decode(encoded).decode('utf8', errors='replace')

Later on those decoded strings are sent to the viper/common/out.py:table(header, rows) function, which uses an AsciiTable to print them:
https://github.com/viper-framework/viper/blob/master/viper/common/out.py#L58

Example:

from terminaltables import AsciiTable
table_data = [
    ['Decoded', 'Raw'],
    ['\\xefbfbd\\xefbfbd"\\xefbfbd\\xefbfbd"v[\\x07\r\\xefbfbd\\x1d', 'go4ihosidlsHDasd'],
    ['\x0cQ\r', 'DFEN'],
    ['0\\xefbfbd\\xf2808ca4\\xefbfbd\\xefbfbdF\\x0e,\\xefbfbd', 'MNfygIyki6FGDiyd'],
    ['nyl\\xefbfbd\\xefbfbd', 'bnlsweSd']
]
table = AsciiTable(table_data)
print(table.table)

This code fails because terminaltables tries to interpret the input to format multiline strings:
https://github.com/Robpol86/terminaltables/blob/master/terminaltables/width_and_alignment.py#L58
and eventually crashes on this line because some columns now contain more lines than others:
https://github.com/Robpol86/terminaltables/blob/master/terminaltables/build.py#L140

The easiest solution seems to escape all special characters in the table() function, so the input is no longer split into multiple lines.

Example output with this solution:

+--------------------------------------------------------+------------------+
| Decoded                                                | Raw              |
+--------------------------------------------------------+------------------+
| \xefbfbd\xefbfbd"\xefbfbd\xefbfbd"v[\x07\r\xefbfbd\x1d | go4ihosidlsHDasd |
| \x0cQ\r                                                | DFEN             |
| 0\xefbfbd\xf2808ca4\xefbfbd\xefbfbdF\x0e,\xefbfbd      | MNfygIyki6FGDiyd |
| nyl\xefbfbd\xefbfbd                                    | bnlsweSd         |
+--------------------------------------------------------+------------------+