Improve malformed identifiers handling in -ren=1
mode
#709
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This patch propose following improvements to the default renaming functionality:
All identifiers should be compliant to the JLS9 section 3.8 and SHOULD NOT contains so-called "ignorable" characters.
Ignorable characters are silently removed by javac during the compilation and thus may appear only in specially crafted obfuscated classes.
For more information about "ignorable" characters see JDK-7144981.
Add dedicated unit tests for
org.jetbrains.java.decompiler.modules.renamer.ConverterHelper
class.