fix '+= operator does not work with strings ' #2687
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Changed the logic slightly for DialogicVariableEvents to work and not print an error when an event tries to add a string to a string variable. The standard "Set Variable event failed because one value wasn't a float!" error will be printed if the user tries to add a non-string to a string variable.
Also updated the editor warnings to not show an error when a string is being added to a string.
My changes work, but feels slightly invasive/messy. Thoughts? I can try and clean it up.
fixes #2601