ToInt64 now throws exception when appropriate

[MateuszKlatecki]

Description

Convert function didn't throw exceptions if value in input string isn't correct number or is out of range and returns 0 in above situation. After this change exceptions are thrown.

Motivation and Context

• Fixes problem with incorrect parse integers

How Has This Been Tested?

I wrote a simple program that tests various possibilities. I can add it to example programs.
There is still problem during UInt64 and Int64 Parse. If value is out of range function didn't throw exception but return maximal or minimal allowed value.

Sample output:
ConverterTestOutput.txt

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

Signed-off-by: GITHUB_USER <GITHUB_USER_EMAIL>

[nfbot]

Hi @MateuszKlatecki,

I'm nanoFramework bot.
Thank you for your contribution!

A human will be reviewing it shortly. 😉

[josesimoes]

@MateuszKlatecki yes please add some test code to the samples.
Also copy/paste the output in the PR comment above, please. Just to keep a record of the output.

[josesimoes]

LGTM!