Add DateTime placeholders to AutoType feature

[CompileNix]

This PR adds support for AutoType DateTime placeholders, in the same way KeePass2 has it.

https://keepass.info/help/base/placeholders.html

PS: This is my first contribution to a C++ project in general and KeePassXC specifically :)

Type of change

• ✅ New feature (non-breaking change which adds functionality)

Description and Context

I used DateTime placeholders in KeePass2 all the time, but switched to KeePassXC. So i added the following AutoType placeholders.

Placeholder	Is Replaced By
{DT_SIMPLE}	Current local date/time as a simple, sortable string. For example, for 2012-07-25 17:05:34 the value is 20120725170534.
{DT_YEAR}	Year component of the current local date/time.
{DT_MONTH}	Month component of the current local date/time.
{DT_DAY}	Day component of the current local date/time.
{DT_HOUR}	Hour component of the current local date/time.
{DT_MINUTE}	Minute component of the current local date/time.
{DT_SECOND}	Seconds component of the current local date/time.
{DT_UTC_SIMPLE}	Current UTC date/time as a simple, sortable string.
{DT_UTC_YEAR}	Year component of the current UTC date/time.
{DT_UTC_MONTH}	Month component of the current UTC date/time.
{DT_UTC_DAY}	Day component of the current UTC date/time.
{DT_UTC_HOUR}	Hour component of the current UTC date/time.
{DT_UTC_MINUTE}	Minute component of the current UTC date/time.
{DT_UTC_SECOND}	Seconds component of the current UTC date/time.

Screenshots

• None

Testing strategy

1. Create a new Database
2. Add a new Entry
3. Add Auto-Type Window Assosiation
   Title: * - Notepad
   Use a specific sequence for this assosiation: DT_SIMPLE: {DT_SIMPLE}{ENTER}DT_YEAR: {DT_YEAR}{ENTER}DT_MONTH: {DT_MONTH}{ENTER}DT_DAY: {DT_DAY}{ENTER}DT_HOUR: {DT_HOUR}{ENTER}DT_MINUTE: {DT_MINUTE}{ENTER}DT_SECOND: {DT_SECOND}{ENTER}DT_UTC_SIMPLE: {DT_UTC_SIMPLE}{ENTER}DT_UTC_YEAR: {DT_UTC_YEAR}{ENTER}DT_UTC_MONTH: {DT_UTC_MONTH}{ENTER}DT_UTC_DAY: {DT_UTC_DAY}{ENTER}DT_UTC_HOUR: {DT_UTC_HOUR}{ENTER}DT_UTC_MINUTE: {DT_UTC_MINUTE}{ENTER}DT_UTC_SECOND: {DT_UTC_SECOND}
4. Enable Global Auto-Type
5. Define Global Auto-Type shortcut
6. Open Notepad
7. Perform Auto-Type via Global Auto-Type shortcut

Expected (example) result, for DateTime Sun, 08 Mar 2020 18:11:43 GMT and local timezone UTC +0100:

DT_SIMPLE: 20200308191143
DT_YEAR: 2020
DT_MONTH: 03
DT_DAY: 08
DT_HOUR: 19
DT_MINUTE: 11
DT_SECOND: 43
DT_UTC_SIMPLE: 20200308181143
DT_UTC_YEAR: 2020
DT_UTC_MONTH: 03
DT_UTC_DAY: 08
DT_UTC_HOUR: 18
DT_UTC_MINUTE: 11
DT_UTC_SECOND: 43

Checklist:

• ✅ I have read the CONTRIBUTING document. [REQUIRED]
• ✅ My code follows the code style of this project. [REQUIRED]
• ✅ All new and existing tests passed. [REQUIRED]

[CompileNix]

You may want to add mingw-w64-$(uname -m)-clang to Set up Build Environment on Windows, which installes the requirement clang-format for make format

[droidmonkey]

Good point!

[droidmonkey]

I'm surprised we don't have an issue requesting this feature parity.

Changes were made

[CompileNix]

\o/