* Mainly changes:
* Message attachments faults detecting, and allow to dump whole embeded message alone to files.
* Multi-line message acceptable in sending, (End with `Ctrl+D`)and allow resent on 'Connection Error.'
* Print out detailed API Error returned.
* Update Contacts list cmd, bcz contact list API returns unEncoded lable.
* Message pull routing refine, mainlly access inbox messages by IDs, to reduce bandwidth usages.
* API connections `SOCKS5` `HTTP` proxied.
* UIs
* Shorten the user cmds inputs.
* Try to remember user last choices.
* Refine user input checkings.(rest to default selection by input a blank string)
* A comprehensive command line parser, override configurations read from file `client.dat` in current working directory.
* Message review limited to 380 characters in default.
default settings `client.dat`
```
[global]
start_daemon = http://127.0.0.1:8888
start_daemon = http://127.0.0.1:8445
[api]
path = 127.0.0.1:8445
type = HTTP
[proxy]
path = 127.0.0.1:1080
type = none
timeout = 30
remotedns = True
```
Signed-off-by: peter-tank <30540412+peter-tank@users.noreply.github.com>
