Avoid out-of-memory problems in log viewer

Avoid out-of-memory problems in log viewer

fixes #3919

Squashed commit of the following:

commit 322d0846f39b0641ab7af69e24d1bd70a95b58b5
Author: Andreas Gohr <andi@splitbrain.org>
Date:   Mon Mar 20 18:45:30 2023 +0100

    some more simplifications for the log viewer

    * use exceptions to abort on read errors
    * use the same fread call regardless of log size

commit b8a3dfbd90a77811db380510cc279f973c92bd01
Author: Hamid <hamid0x4c@gmail.com>
Date:   Mon Mar 20 17:49:41 2023 +0330

    Fix code style

commit aa0e5b6692f9c26a9c22875111760803e280c9ac
Merge: 23b372c94 ac1d8211a
Author: Hamid <hamid0x4c@gmail.com>
Date:   Mon Mar 20 17:39:05 2023 +0330

    Merge branch 'dokuwiki:master' into fix-display-large-log

commit 23b372c94d466ff3436177bf8386c879b78c5777
Merge: d82b8818c e410a7b8f
Author: Hamid Adibzadeh <hamid0x4c@gmail.com>
Date:   Mon Mar 20 17:35:07 2023 +0330

    Merge branch 'fix-display-large-log' of github.com:Adibzadeh/dokuwiki into fix-display-large-log

commit d82b8818c86f614f7d504cf19ad6d0492bb6d92f
Author: Hamid Adibzadeh <hamid0x4c@gmail.com>
Date:   Mon Mar 20 17:29:43 2023 +0330

    Use only fopen to read logfile

commit e410a7b8fa7663039bbdcfd6a90aed89877bb744
Author: Hamid <hamid0x4c@gmail.com>
Date:   Sat Mar 18 10:30:19 2023 +0330

    White-space removed

commit 8f1ad23f785b1cccb790b39371b8989514777a38
Author: Hamid Adibzadeh <hamid0x4c@gmail.com>
Date:   Sat Mar 18 10:12:16 2023 +0330

    Refactoring getLogLines and code improvements

commit 37a0e60c920343ff45ed12ede2cf96c2251108a3
Author: Hamid Adibzadeh <hamid0x4c@gmail.com>
Date:   Sat Mar 18 00:27:27 2023 +0330

    Refactoring and improve error handling

commit 25d3465289053130546c9066c82b0b620f596c33
Author: Hamid Adibzadeh <hamid0x4c@gmail.com>
Date:   Sat Mar 18 00:00:59 2023 +0330

    Translation for log errors in Fa and En

commit cc96b9babee12e4f4678380208685b3497a29b70
Author: Hamid Adibzadeh <hamid0x4c@gmail.com>
Date:   Fri Mar 17 00:34:06 2023 +0330

    code improve

commit 9c0e42285fc8d553e26c030d407d46f69f8c3d91
Author: Hamid <hamid0x4c@gmail.com>
Date:   Tue Mar 14 18:16:23 2023 +0330

    variable name fixed

commit 89124317ba2cccc12cb506f4d641a9e6288969e1
Author: Hamid <hamid0x4c@gmail.com>
Date:   Tue Mar 14 18:13:30 2023 +0330

    tab indent fix

commit b154bfde3ecd2039c16b8f8002ada291301e19b2
Author: Hamid Adibzadeh <hamid0x4c@gmail.com>
Date:   Tue Mar 14 17:21:09 2023 +0330

    fix #3919 log viewer runs into OOM