Do not consider case of partial text when offering hints

[max-privato]

Description

A useful characteristic of OMEdit is the hints we get when we write code.
For instance, consider writing a Unit of Measure. There are so many of them in MSL that having help in finding the correct one is a boon.
However, to have a hint one should write the first part of what they are looking for case sensitive,
This is not optimal for two reasons:

1. when we look for something maybe we don't know exactly if the part of the name we remember is uppercase or lowercase or whatever.
2. Writing all lowercase is faster, and programmers prefer to use it even though they know the correct case.

For instance if I look for "angular" quantities, when I write
Modelica.SIunits.ang
I don't get any hint, while if I write
Modelica.SIunits.Ang I get hints.

Other tools, such as Qt Creator, give code hints in the way I propose for OpenModelica (i.e. not considering the case of what one writes).
Obviously, if my proposal is agreed upon, making the correction would involve a minimal effort (possibly changing a single row of code).

Steps to Reproduce

Expected Behavior

Code should be hinted based on what the user writes, no matter the case of the letters

Screenshots

Version and OS

• OpenModelica Version: [e.g. omc --version or Help->About OMEdit from OMEdit]
• OS: [e.g. Windows 10, 64 bit]
• Versions of used Modelica libraries if applicable

Additional Context

[casella]

@adeas31, could this be a one-liner modification, as @ceraolo suggests?

[casella]

Thanks Adeel, highly appreciated!

[max-privato]

Thank you!
By the way, I made a mistake: the fix involved two lines instead of one :-)
Thanks again also for the speed.