Add Calculator screen as new App

A calculator based on the Shunting-yard algorithm as described
here: https://en.wikipedia.org/wiki/Shunting-yard_algorithm

Moving the Motion App into the Settings screen to use the tile in the
ApplicationList for the Calculator.

4 files changed, 9 insertions, 0 deletions

diff --git a/doc/Calculator.md b/doc/Calculator.md
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+# Calculator Manual
+This is a simple Calculator with support for the four basic arithmetic operations, parenthesis and exponents.
+Here is what you need to know to make full use of it:
+- Swipe left to access parenthesis and exponents:
+   ![](./ui/calc2.jpg)
+- A long tap on the screen will reset the text field to `0`.
+- If the entered term is invalid, the watch will vibrate.
+- results are rounded to 4 digits after the decimal point
+- **TIP:** you can use `^(1/2)` to calculate square roots
diff --git a/doc/ui/calc2.jpg b/doc/ui/calc2.jpg
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diff --git a/doc/ui/calc3.jpg b/doc/ui/calc3.jpg
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diff --git a/doc/ui/calc4.jpg b/doc/ui/calc4.jpg
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