Graph Panel widget: round off axes values whenever possible (#2518)

Qwt: upgrade to version 6.2.0 (#2517)

Qwt: upgrade to version 6.2.0 (#2517)

LLVM+Clang: upgrade to version 12.0.1 (#2515)

New snapshot

CellML Text view: support piecewise statements anywhere (#575)

Simulation Experiment view: random crashes when reloading a file (#2510)

CellML tools: prevent a Qt warning when starting OpenCOR with no file

QScintilla: upgrade to version 2.13.0 (#2503)

QScintilla: upgrade to version 2.13.0 (#2503)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

KaTeX: upgrade to version 0.13.11 (#2504)

Oxygen icons: upgraded to version 5.83.0.

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)

Python support: improve error handling (#2493)