abs-lang / abs / 374

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number.round(decimals), number.floor(), number.ceil()

closes #183, closes #184, closes #185

```
10.9.floor() # 10
"a".floor() # ERROR: floor(...) can only be called on strings which represent numbers, 'a' given
"10.9".floor() # 10
10.3.ceil() # 11
"a".ceil() # ERROR: ceil(...) can only be called on strings which represent numbers, 'a' given
"10.3".ceil() # 11
10.3.round() # 10
10.6.round() # 11
10.333.round(1) # 10.3
"10.333".round(1) # 10.3
"a".round() # ERROR: round(...) can only be called on strings which represent numbers, 'a' given
```

60 of 60 new or added lines in 1 file covered. (100.0%)

2400 of 3265 relevant lines covered (73.51%)

82.73 hits per line