Added number transformations for external data

- Round allows you to round the numbers in the column up to a given number of decimal places
- Round Up rounds the numbers in the column up to the nearest whole number
- Round Down rounds the numbers in the column down to the nearest whole number
- Absolute Value returns the absolute value of the numbers in the column
- Logarithm
- Natural returns the natural logarithm
- Base-10 returns the base-10 logarithm
- Cube returns the cube of the numbers
- Square returns the square of the numbers
- Square Root returns the square root of the numbers
- Is Even returns TRUE if the values in the column are eve
- Is Odd returns TRUE if the values in the column are odd
- Sign returns 1 if the values in the column are positive, -1 if they are negative, and 0 otherwise.

Change-Id: I7458d0d61da3749fe497b3999449373234391b04
Reviewed-on: https://gerrit.libreoffice.org/56886
Tested-by: Jenkins
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

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