paclog: add color for errors and notes

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
paclog: add caller filter

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
paclog: add action filter

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
paclog: add warnings filter

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
pacutils/log: calculate tm_isdst

Setting this to 0 causes mktime to adjust the timestamp if it is during
daylight savings time.

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
paclog: add terminating longopt

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
README: add example paclog usage

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>