Change any OSM length units from cm to m

[Robbendebiene]

Resolves #128

Explanation:

Inputs | PAD  | INSERT | REPLACE
1      > 001  > 0.01   > 0.01
1000   > 1000 > 10.00  > 10
12     > 012  > 0.12   > 0.12
0      > 000  > 0.00   > 0
102    > 102  > 1.02   > 1.02
120    > 120  > 1.20   > 1.2

Note:

• This expression combination only works for positive integers (not for negative or decimal numbers) and does a conversion by exactly two decimal places to the left.
• This PR changes the platform width unit from centimeters to meters, mainly because it seems more reasonable. Counter argument to do this, could be that so far all length units use centimeter so users could expect centimeters after all. However the min/max restrictions should at least prevent wrong input values.