pidgin/pidgin

Add the cpu, cpu_family, and endianness of the host machine to the about dialog

Also added the Adwaita version as that'll be handy too.

Testing Done:
Opend the about box and verified there weren't any warnings and that all of the data looked accurate.

Reviewed at https://reviews.imfreedom.org/r/2910/
Title: Account Signals
Slug: account-signals
## Account Signals
### Signal List
* [account-status-changed](#account-status-changed)
* [account-signed-on](#account-signed-on)
* [account-signed-off](#account-signed-off)
### Signal Details
#### account-created
```c
void user_function(PurpleAccount *account, gpointer user_data);
```
Emitted when an account is created by calling purple_account_new.
**Parameters:**
**account**
: The account.
**user_data**
: User data set when the signal handler was connected.
----
#### account-destroying
```c
void user_function(PurpleAccount *account, gpointer user_data);
```
Emitted when an account is about to be destroyed.
**Parameters:**
**account**
: The account.
**user_data**
: User data set when the signal handler was connected.
----
#### account-status-changed
```c
void user_function(PurpleAccount *account,
PurpleStatus *old,
PurpleStatus *new,
gpointer user_data);
```
Emitted when the status of an account changes (after the change).
**Parameters:**
**account**
: The account that changed status.
**old**
: The status before change.
**new**
: The status after change.
**user_data**
: User data set when the signal handler was connected.
----
#### account-signed-on
```c
void user_function(PurpleAccount *account, gpointer user_data);
```
Emitted when an account has signed on.
**Parameters:**
**account**
: The account that has signed on.
**user_data**
: User data set when the signal handler was connected.
----
#### account-signed-off
```c
void user_function(PurpleAccount *account, gpointer user_data);
```
Emitted when an account has signed off.
**Parameters:**
**account**
: The account that has signed off.
**user_data**
: User data set when the signal handler was connected.