`tryTo<>` generics for string to integer conversion
The first approach to substitute all `safeStrto*` conversions to `tryTo<>` generics.
Thare are some advantages in using templates here:
- Destination value type explicitly takes a part in call syntax.
- You could use it other template code
Also I have removed `safeStrtoi` from the code as an example of usage.
* Ephemeral native support for int
Ephemeral supports int without serialization.
Dump get and put pushed from database.cpp to the database plugin.
Basic support for rocksDB and sqlite
* status messages
* style and compilation problems fix
* const int& to int for database get
* const int& to int for database put
* more specific exception type of boost variant get
* eohemeral improvements
code repetition reduced
map operations reduced
error message improved
#everything, next in the following.
* safeStrtoi implementation and use
* code formatting
* atoi accepts base int type
* error message add to status
* compilation error and format correction
2. Introduce a SQLite-based database plugin
3. Refactor database usage to include local 'fast-calls'
4. Introduce an 'ephemeral' database plugin for testing (like a mock)
