Trimmer optimization

[kvpt]

Current trimmer implementation use Regex which is slow.
Replace it with native string manipulation.
This is about 100x faster and also this don't reallocate a string if not needed, so less allocation on average.

Before :

Method	Mean	Error	StdDev	Gen 0	Gen 1	Gen 2	Allocated
TrimAll	1.007 us	0.0057 us	0.0054 us	0.0114	-	-	192 B

After :

Method	Mean	Error	StdDev	Gen 0	Gen 1	Gen 2	Allocated
TrimAll	65.02 ns	0.437 ns	0.388 ns	0.0101	-	-	160 B

[bleroy]

Nice! I'll test that as soon as I can.

[bleroy]

Thanks for the contribution, this looks mostly good, I just have a few minor requests.

[bleroy]

Thanks!