Fix unintitialized reference conflict on catch

An exception reference declared in a catch clause was considered as an unintitalised variable
when a closure parameter use the same name than the exception reference.

The following code works now as expected:

```golo
module InitializedReference

function main = |args| {
  let func = |e| {
    return e + 1
  }

 try {
   return func(41)
 } catch(e) {
    # may never happened
 }
}
```
Add generator script for unicode identifier.
Apply generated code
Update test code
Merge pull request #223 from Artpej/fix/uninitialized-reference-on-catch

Fix unintitialized reference conflict on catch
Merge pull request #224 from MakeNowJust/unicode-identifier-2

More support unicode identifier
A note on non-ascii characters
Fix concurrent methods resolution
Merge pull request #222 from Artpej/fix/concurent-method-resolution

Fix concurrent methods resolution