Add a Clear/Erase All tool

Problem: It is problematic to remove all bodies in the canvas, one by one,
to get a clear screen. A clear all tool is certainly needed.

Solution: Implement a Clear All tool, which also asks for confirmation before
destroying everything.

Fixes #1615

1 files changed, 115 insertions, 0 deletions

diff --git a/icons/clear_all.svg b/icons/clear_all.svg
new file mode 100644
index 0000000..4316a3a
--- /dev/null
+++ b/icons/clear_all.svg
@@ -0,0 +1,115 @@
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