The init methods from the plugins should be run before micro starts handling buffers

Description of the problem or steps to reproduce

When micro handles files specified on the command line, Buffers and BufPanes of these files are created before the init method from the plugins are run. This put plugins who wants to provide 'open on start' features in a delicate position: when the plugin initializes, the 'events' it needs to handle are passed already.

Use the following dummy plugin in ~/.config/micro/plug/dummy/dummy.lua

local micro  = import("micro")

local function pane_str(pane)
    local ret = 'nil'
    if pane then
        ret = pane:ID()..':'..pane.Buf:GetName()
    end
    return ret
end

function onBufferOpen(buf)
    micro.Log('>> onBufferOpen('..buf:GetName()..')')
    micro.Log('<< onBufferOpen')
end

function onBufPaneOpen(pane)
    micro.Log('>> onBufPaneOpen('..pane_str(pane)..')')
    micro.Log('<< onBufPaneOpen')
end

function init()
    micro.Log('>> init')
    micro.Log('<< init')
end

then launch micro opening 2 files:
micro -debug python_file.py test.lua

Close micro and look at the log file:

2020/03/30 13:21:03 Micro started
2020/03/30 13:21:05 >> onBufferOpen(python_file.py)
2020/03/30 13:21:05 << onBufferOpen
2020/03/30 13:21:05 >> onBufferOpen(test.lua)
2020/03/30 13:21:05 << onBufferOpen
2020/03/30 13:21:05 >> onBufPaneOpen(0:python_file.py)
2020/03/30 13:21:05 << onBufPaneOpen
2020/03/30 13:21:05 >> onBufPaneOpen(0:test.lua)
2020/03/30 13:21:05 << onBufPaneOpen
2020/03/30 13:21:05 >> onBufferOpen(No name)
2020/03/30 13:21:05 << onBufferOpen
2020/03/30 13:21:05 >> onBufPaneOpen(0:No name)
2020/03/30 13:21:05 << onBufPaneOpen
2020/03/30 13:21:05 >> onBufferOpen(Log)
2020/03/30 13:21:05 << onBufferOpen
2020/03/30 13:21:05 >> init
2020/03/30 13:21:05 << init

Specifications

OS: Ubuntu 19.10
Version: 2.0.3-dev.21
Commit hash: 1cf9537
Compiled on March 27, 2020

Happens also with the latest official release 2.0.2.

Start at micro's startup sequence where command-line files create Buffers and BufPanes, then inspect when plugin init is invoked relative to onBufferOpen and onBufPaneOpen. Reproduce with the dummy.lua plugin and micro -debug python_file.py test.lua; done means init runs before those startup buffer and pane events.