2024-01-17: release 3.1.3

* Added C.LN1+X and C.E^X-1 functions. These are complex-capable versions of
LN1+X and E^X-1.
* Fixed pasting of strings that start with E.
* Binary version: When converting binary to decimal, only use 17 digits when
actually needed. This prevents 0.1 from turning into 1.0000000000000001e-1,
for example.
* iOS version: Support for external keyboards.

2023-12-18: release 3.1.2b (Android only)

* Fixed file access for Android >= 11.

2023-12-12: release 3.1.2a (iOS and MacOS)

* Fixed crash when loading skin images with local colormaps, caused by a bug in
Xcode 15.

2023-12-01: release 3.1.2

* CSLD? did not handle intervening XEQ/RTN. Fixed.
* FUNC did not detect previous FUNC/LNSTK/L4STK. Fixed.

2023-11-29: release 3.1.1

* In the matrix / list editor (EDIT and EDITN), GOTO would prompt for a column
even when editing a list, and any column number other than 1 would cause an
error. Lists are one-dimensional, so the user should only be asked for a row.
Fixed.
* iOS and MacOS versions: ASSIGN "" didn't work, because the second ENTER
wasn't being handled correctly. This was caused by an optimizer bug in
Apple's latest compiler. Fixed.

2023-11-15: release 3.1

* EDIT, EDITN, and INDEX now support editing lists, nested lists, empty lists,
and matrices within lists. See the Free42 web site for details.
* FUNC now hides the caller's RPN stack, so user-defined functions can use
functions like CLST and R↓ without causing side effects.
* User-defined functions can now be made to support 'stack lift disable'
properly. For functions using FUNC, this happens automatically, and other
functions can use the new CSLD? function (Caller's Stack Lift Disabled?).
* FNRM and UVEC, when called with very large parameters, could get incorrect
results due to overflows in intermediaries. Fixed.
* Fixed parameter bounds check in PIXEL.
* Windows, MacOS, and Linux versions: Keyboard maps now support separate
mappings for unshifted and shifted numeric keypad keys, and unshifted and
shifted Space.