Placeholders for all roles

[supercoolspy]

Adds placeholders for all roles based on #1494 placeholders would end up being:

%discordsrv_role_roleid_name% = Cool Role Name
%discordsrv_role_roleid_color_hex% = #FFFFFF
%discordsrv_role_roleid_color_code% = &F&F&F&F&F&F (Converted to color and would not show up as text)

[supercoolspy]

@Vankka can you re-run the build? I updated from dev

[Vankka]

Thank you for your PR and sorry about the late response

I would prefer if the roleId logic was shared for these placeholders, the regular expression could also use groups to catch the role id and "sub placeholder". Example of what I mean:

private static final Pattern SPECIFIC_ROLE_PATTERN = Pattern.compile("role_(\\d+)_(\\w+)");

Matcher rolePlaceholderMatcher = SPECIFIC_ROLE_PATTERN.matcher(identifier);
if (rolePlaceholderMatcher.matches()) {
    String roleId = rolePlaceholderMatcher.group(1);
    Role role = DiscordUtil.getRole(roleId);
    String subPlaceholder = rolePlaceholderMatcher.group(2);
    
    if (subPlaceholder.equals("name")) {
        ...
    }
}

(The above is untested code)

[Vankka]

Suggested change

	if(identifier.startsWith("role_")) {
	if (identifier.startsWith("role_")) {

Styling nitpick