Performance optimization (dupplicate call of strtoupper and multiple calls auf preg_replace)

[fglueck]

strtoupper also in setSelectedCells()

This is:

- [X] a bugfix
- [ ] a new feature

Checklist:

• Changes are covered by unit tests
• Code style is respected
• Commit message explains why the change is made (see https://github.com/erlang/otp/wiki/Writing-good-commit-messages)
• CHANGELOG.md contains a short summary of the change
• Documentation is updated as necessary

Why this change is needed?

Just for Performance

look at:
public function setSelectedCells($pCoordinate)
{
// Uppercase coordinate
$pCoordinate = strtoupper($pCoordinate);

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
If this is still an issue for you, please try to help by debugging it further and sharing your results.
Thank you for your contributions.

[fglueck]

is this fix not needed?

[oleibman]

getStyle no longer performs strtoupper, and the Validations class, new since this PR was introduced, combines its preg_replace calls into 1. Removing stale label, but keeping PR closed.