Renaming module files and names crashes module reloading code.

[jurgenvinju]

Describe the bug

• rename a module that was previously loaded on the REPL (on the commandline or in VScode)
• type any command
• typical output (here I've renamed 4 modules):

rascal>import lang::rascal::tests::extends5::Top;
[INFO] reloading module: lang::rascal::tests::extends5::D
[INFO] reloading module: lang::rascal::tests::extends5::C
[INFO] reloading module: lang::rascal::tests::extends5::B
[INFO] reloading module: lang::rascal::tests::extends5::A
[INFO] reloading module: lang::rascal::tests::extends5::Top
[ERROR] Could not import module lang::rascal::tests::extends5::D: can not find in search path
Advice: |https://www.rascal-mpl.org/docs/Rascal/Errors/CompileTimeErrors/ModuleImport|
[ERROR] Could not import module lang::rascal::tests::extends5::C: can not find in search path
Advice: |https://www.rascal-mpl.org/docs/Rascal/Errors/CompileTimeErrors/ModuleImport|
[ERROR] Could not import module lang::rascal::tests::extends5::B: can not find in search path
Advice: |https://www.rascal-mpl.org/docs/Rascal/Errors/CompileTimeErrors/ModuleImport|
[ERROR] Could not import module lang::rascal::tests::extends5::A: can not find in search path
Advice: |https://www.rascal-mpl.org/docs/Rascal/Errors/CompileTimeErrors/ModuleImport|

• the error is persistent (which can be a different issue)